Smart container monitoring system

FIELD OF THE INVENTION

0001The present invention relates to shipping and transportation of goods and more particularly to remotely monitorable shipping containers.

BACKGROUND OF THE INVENTION

0002The following U.S. Patents are believed to represent the current state of the art:

0003<patcit id="pcit0001" dnum="US4750197A"><text>4,750,197</text></patcit>; <patcit id="pcit0002" dnum="US5056837A"><text>5,056,837</text></patcit>; <patcit id="pcit0003" dnum="US5097253A"><text>5,097,253</text></patcit>; <patcit id="pcit0004" dnum="US5127687A"><text>5,127,687</text></patcit>; <patcit id="pcit0005" dnum="US5169188A"><text>5,169,188</text></patcit>; <patcit id="pcit0006" dnum="US5189396A"><text>5,189,396</text></patcit>; <patcit id="pcit0007" dnum="US5406263A"><text>5,406,263</text></patcit>; <patcit id="pcit0008" dnum="US5421177A"><text>5,421,177</text></patcit>; <patcit id="pcit0009" dnum="US5587702A"><text>5,587,702</text></patcit>; <patcit id="pcit0010" dnum="US5656996A"><text>5,656,996</text></patcit>, <patcit id="pcit0011" dnum="US6069563A"><text>6,069,563</text></patcit>and <patcit id="pcit0012" dnum="US4688244A"><text>4,688,244</text></patcit>.

SUMMARY OF THE INVENTION

0004The present invention seeks to provide an improved remotely monitorable shipping container.

0005There is thus provided in accordance with a preferred embodiment of the present invention, a remotely monitorable shipping container including a shipping container body having associated therewith at least one door and at least one door latch having a latch locking element arranged for locking engagement with a door mounted locking element, at least one wireless communicator mounted in a secure location within the shipping container and being operative to wirelessly transmit information to a remote monitor regarding the status of an electronic seal mounted onto the locking element for confirming locking of the at least one door, and at least one wireless antenna mounted within a protected enclosure on the outside of the shipping container for transmitting the information from the at least one wireless communicator.

0006In accordance with a preferred embodiment, the at least one wireless communicator includes a transceiver. Preferably, the latch locking element includes a tamper-resistant remotely monitorable electronic seal including a shaft portion, a socket arranged to engage the shaft portion in a monitorable manner, whereby disengagement of the socket and the shaft portion results in a monitorable event, and a wireless communicator associated with at least one of the shaft portion and the socket and being operative to provide a remotely monitorable indication of the monitorable event.

0007In accordance with another preferred embodiment, the remotely monitorable shipping container also includes at least one sensor operative to sense at least one condition within the shipping container and wherein the at least one wireless transmitter and the at least one wireless antenna are operative to wirelessly transmit information regarding an output of the at least one sensor to a remote monitor. Preferably, the at least one sensor senses at least one of motion, carbon dioxide, infra-red emissions and temperature. Additionally, the at least one wireless communicator also transmits information regarding the status of the cargo, which is placed in the shipping container body.

0008In accordance with yet another preferred embodiment, the remotely monitorable shipping container also includes at least one GPS antenna for receiving signals relating to location of the shipping container and location reporting circuitry responsive to an output from the at least one GPS antenna for providing information to the at least one wireless communicator indicating location of the shipping container. Preferably, the at least one wireless communicator includes at least one RF transmitter. Additionally, the at least one wireless communicator includes at least one long range transmitter. Preferably, the at least one wireless communicator includes a transmitter communicating via at least one of cellular, radio and satellite communication networks.

0009There is also provided in accordance with a preferred embodiment of the present invention, a shipping container communications system which includes a remotely monitorable shipping container including a shipping container body having associated therewith at least one door and at least one door latch having a latch locking element arranged for locking engagement with a door mounted locking element, at least one wireless communicator mounted in a secure location within the shipping container and being operative to wirelessly transmit information to a remote monitor regarding the status of an electronic seal mounted onto the locking element for confirming locking of the at least one door, and at least one wireless antenna mounted within a protected enclosure on the outside of the shipping container for transmitting the information from the at least one wireless communicator. The shipping container communications system also includes at least one remote communicator communicating with the at least one wireless communicator. Preferably, the at least one wireless communicator includes at least one transceiver, communicating with the at least one remote communicator. Additionally, the at least one remote communicator includes at least one of a presence sensor and communicator, a remote monitor, and an electronic seal.

BRIEF DESCRIPTION OF THE DRAWINGS

0010The present invention will be understood and appreciated more fully from the following detailed description, taken in conjunction with the drawings in which:

0011<figref idref="f0001">Fig. 1</figref> is a simplified illustration of a shipping container communications system constructed and operative in accordance with a preferred embodiment of the present invention;

0012<figref idref="f0002">Fig. 2</figref> is a simplified illustration showing sealing engagement of a door lock handle of a shipping container of the type illustrated in <figref idref="f0001">Fig. 1</figref>;

0013<figref idref="f0003">Fig. 3</figref> is a sectional illustration taken along lines III - III of <figref idref="f0002">Fig. 2</figref>;

0014<figref idref="f0004">Fig. 4</figref> is a simplified illustration showing an alternative embodiment of sealing engagement of a door lock handle of a shipping container of the type illustrated in <figref idref="f0001">Fig. 1</figref>;

0015<figref idref="f0005">Figs. 5A and 5B</figref> are simplified pictorial illustrations of two stages in the assembly of a press-fit electronic seal particularly useful as a tamper resistant remotely monitorable electronic seal of the type illustrated in <figref idref="f0004">Fig. 4</figref>;

0016<figref idref="f0006">Figs. 6A and 6B</figref> are simplified pictorial illustrations of two different types of breaks produced in the press-fit electronic seal of <figref idref="f0005">Figs. 5A and 5B</figref>;

0017<figref idref="f0007">Figs. 7A and 7B</figref> are simplified pictorial illustrations of two stages in the assembly of a lockable electronic seal particularly useful as a tamper resistant remotely monitorable electronic seal of the type illustrated in <figref idref="f0004">Fig. 4</figref>;

0018<figref idref="f0008">Figs. 8A and 8B</figref> are simplified pictorial illustrations of two different types of breaks produced in the lockable electronic seal of <figref idref="f0007">Figs. 7A and 7B</figref>;

0019<figref idref="f0009">Figs. 9A and 9B</figref> are simplified pictorial illustrations of two stages in the assembly of a press-fit electronic seal particularly useful as a tamper resistant remotely monitorable electronic seal of the type illustrated in <figref idref="f0004">Fig. 4</figref>;

0020<figref idref="f0010">Figs. 10A and 10B</figref> are simplified pictorial illustrations of two different types of breaks produced in the press-fit electronic seal of <figref idref="f0009">Figs. 9A and 9B</figref>;

0021<figref idref="f0011">Figs. 11A and 11B</figref> are simplified pictorial illustrations of two stages in the assembly of a lockable electronic seal particularly useful as a tamper resistant remotely monitorable electronic seal of the type illustrated in <figref idref="f0004">Fig. 4</figref>; and

0022<figref idref="f0012">Figs. 12A and 12B</figref> are simplified pictorial illustrations of two different types of breaks produced in the lockable electronic seal of <figref idref="f0011">Figs. 11A and 11B</figref>.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT

0023Reference is now made to <figref idref="f0001 f0002 f0003">Figs. 1-3</figref>, which illustrate a shipping container communications system constructed and operative in accordance with a preferred embodiment of the present invention. As seen in <figref idref="f0001">Fig. 1</figref>, a shipping container 10, which may be a conventional shipping container useful for land and sea transport, is shown in communication with multiple communicators, including, for example, a presence sensor and communicator 12, located at the gate of a port, and a remote monitoring center 14, which may communicate via the Internet. It is appreciated that any suitable type of shipping container may be employed. The term "shipping container" is used herein in a very broad sense to include any enclosure in which goods may be transported or stored.

0024Conventionally, shipping containers employ one or more hasps 15, which are fixed to door latches and are rotatably engageable with corresponding lockable members, such as loops 16, in the manner shown in <figref idref="f0001">Figs. 1</figref> and <figref idref="f0002">2</figref>. Typically, a padlock 17 engages a portion of loop 16 which extends through a hasp 15, preventing disengagement of the hasp 15 from the loop 16 and thus preventing unlocking of the door. In order to confirm integrity of the lock, an electronic seal wire 18 is preferably passed through the loop 16 over the hasp 15. A preferred electronic seal wire is described and claimed in applicant/assignee's <patcit id="pcit0013" dnum="US6069563A"><text>U.S. Patent No. 6,069,563</text></patcit>, the description of which is hereby incorporated by reference.

0025In accordance with a preferred embodiment of the present invention, first and second plugs 19, electrically communicating with respective first and second ends of the electronic seal wire 18, are removably received in respective sockets 20, which are recessed behind a wall 22 of a container door.

0026In accordance with a preferred embodiment of the present invention, as seen in <figref idref="f0003">Fig. 3</figref>, the sockets 20 communicate with electronic circuitry 23, which in turn communicates via conductors 24 with RF antennas 26 which are located within an enclosure 28 defined by an outer wall 30 of the container, typically formed of steel, and a cover 32, preferably formed of plastic or other dielectric material, which does not appreciably attenuate the output of the RF antennas 26.

0027Preferably, multiple transceivers forming part of circuitry 23 are employed for receiving and transmitting information relating to the integrity of the seal. Each transceiver preferably operates at an RF frequency characteristic of a given part of the world and communicates via corresponding multiple RF antennas 26. Typical transmission frequencies are 315 MHz for the Far East, 433 MHz for Europe and 916 MHz for the U.S.A. Spread spectrum frequencies may also be employed. It is appreciated that alternatively, unidirectional transmitters may be employed instead of transceivers. The transceivers preferably communicate with electronic seals mounted on the container as well as with external communicators, such as presence sensor and communicator 12, located at the gate of a port and remote monitoring center 14. Presence sensor and communicator 12 also may communicate with remote monitoring center 14.

0028Additionally in accordance with a preferred embodiment of the present invention, GPS and GSM antennas 34 and 36 and/or any other suitable type of communications antennas may also be located within enclosure 28 and may communicate with circuitry 23 for transmitting data recorded by circuitry 23 to the remote monitoring center 14 via antennas 26 and 36. An internal environmental sensor 38, such as one or more sensor which senses carbon dioxide presence, infra-red emissions, temperature and motion may also communicate with circuitry 23. Outputs of sensor 38, which may indicate the presence of contraband within the container may also be transmitted via antennas 26 and 36 for remote monitoring thereof.

0029Reference is now made to <figref idref="f0004">Fig 4</figref>, which illustrates an alternative embodiment of locking a shipping container in a shipping container communications system constructed and operative in accordance with a preferred embodiment of the present invention. As seen in <figref idref="f0004">Fig. 4</figref>, a shipping container 110, which may be a conventional shipping container useful for land and sea transport and which may communicate with multiple communicators, employs one or more hasps 115 which are fixed to door latches and are rotatably engageable with corresponding lockable members, such as loops 116, in the manner shown in <figref idref="f0001">Figs. 1</figref> and <figref idref="f0002">2</figref>. Here a tamper resistant remotely monitorable electronic seal 117 is employed instead of the padlock 17 described hereinabove with reference to <figref idref="f0001">Figs. 1</figref> &amp; <figref idref="f0002">2</figref>. The tamper resistant remotely monitorable electronic seal 117, preferred embodiments of which are described hereinbelow with reference to <figref idref="f0005 f0006 f0007 f0008 f0009 f0010 f0011 f0012">Figs. 5A - 12B</figref> engages a portion of loop 116 which extends through a hasp 115, preventing disengagement of the hasp from the loop and thus preventing unlocking of the door. In order to additionally confirm integrity of the lock, an electronic seal wire 118 is preferably passed through the loop 116 over the hasp 115. A preferred electronic seal wire is described and claimed in applicant/assignee's <patcit id="pcit0014" dnum="US6069563A"><text>U.S. Patent No. 6,069,563</text></patcit>, the description of which is hereby incorporated by reference. In the illustrated embodiment of <figref idref="f0004">Fig. 4</figref>, the electronic seal wire 118 is encased in a reinforced steel sleeve 119.

0030In accordance with a preferred embodiment of the present invention, first and second plugs 120 electrically communicating with respective first and second ends of the electronic seal wire 118 are removably received in respective sockets 121 which are recessed behind a wall 122 of a container door.

0031In accordance with a preferred embodiment of the present invention, the sockets 121 communicate with electronic circuitry (not shown) such as circuitry 23 (<figref idref="f0003">Fig. 3</figref>), which in turn communicates with RF antennas which are located within an enclosure 28 (<figref idref="f0003">Fig. 3</figref>) defined by an outer wall 124 of the container, typically formed of steel, and a cover 125, preferably formed of plastic or other dielectric material, which does not appreciably attenuate the output of the RF transmitting antennas. It is appreciated that the tamper resistant remotely monitorable seal 117 may also communicate directly with presence sensor and communicator 12.

0032Reference is now made to <figref idref="f0005">Figs. 5A and 5B</figref>, which are simplified pictorial illustrations of two stages in the assembly of a press-fit electronic seal particularly useful as tamper resistant remotely monitorable electronic seal 117 in the embodiment of <figref idref="f0004">Fig. 4</figref>.

0033As seen in <figref idref="f0005">Figs. 5A and 5B</figref>, there is provided a tamper-resistant electronic seal which preferably comprises a shaft portion 210, which is integrally formed with or fixed to a sensing circuitry and transceiver portion 212. Shaft portion 210 preferably has a generally cylindrical configuration and terminates in a press-fit tip 214, preferably formed with a series of circumferential teeth 216 which are adapted for press-fit engagement with corresponding tooth-like recesses formed in a socket 218. The press-fit engagement between tip 214 of shaft portion 210 and socket 218 is preferably such that it is impossible to remove the tip 214 from the socket 218 without breaking the shaft portion 210.

0034Shaft portion 210 preferably includes a weakened frangible portion 220, located intermediate the sensing circuitry and transceiver portion 212 and the tip 214. Frangible portion 220 is preferably located closer to sensing circuitry and transceiver portion 212 than to tip 214 and typically has a lesser thickness than the remainder of the shaft portion 210.

0035A conductive loop 222 preferably extends through shaft portion 210 through to the tip 214 thereof and is configured and mounted in shaft portion 210, such that breakage of the shaft portion 210 produces a disconnection or significant change in the electrical properties of the conductive loop 222.

0036In accordance with a preferred embodiment of the present invention, sensing circuitry 224 and an RF transceiver 226 are housed within sensing circuitry and transceiver portion 212. Sensing circuitry 224 is electrically coupled to conductive loop 222 and senses the integrity thereof. Receiving an output from sensing circuitry 224 is transceiver 226, which is operative to provide transmitted information indicating whether the conductive loop 222 is intact. Conventional wireless monitoring circuitry (not shown) may be employed to receive information which is transmitted by RF transceiver 226 and indicates tampering with the seal which results in breakage of the shaft portion 210.

0037Reference is now made to <figref idref="f0006">Figs. 6A and 6B</figref>, which are simplified pictorial illustrations of two different types of breaks produced in the press-fit electronic seal of <figref idref="f0005">Figs. 5A and 5B</figref>. As noted above, application of force to the seal of <figref idref="f0006">Figs. 6A and 6B</figref> in an attempt to separate shaft portion 210 from socket 218 will not cause tip 214 to be disengaged from socket 218, without first breaking the shaft portion 210. <figref idref="f0006">Fig. 6A</figref> shows such a break at a location along the shaft portion 210 which lies just above the tip 214. It is seen that this break produces a disconnection or significant change in the electrical properties of the conductive loop 222.

0038<figref idref="f0006">Fig. 6B</figref> shows such a break at the frangible portion 220 along the shaft portion 210. It is seen that this break also produces a disconnection or significant change in the electrical properties of the conductive loop 222.

0039Reference is now made to <figref idref="f0007">Figs. 7A and 7B</figref>, which are simplified pictorial illustrations of two stages in the assembly of a lockable electronic seal particularly useful as tamper resistant remotely monitorable electronic seal 117 in the embodiment of <figref idref="f0004">Fig. 4</figref>.

0040As seen in <figref idref="f0007">Figs. 7A and 7B</figref>, there is provided a tamper-resistant reusable lockable electronic seal which preferably comprises a shaft portion 310, which is integrally formed with or fixed to a sensing circuitry and transceiver portion 312. Shaft portion 310 preferably has a generally cylindrical configuration and terminates in a lockable tip 314, preferably formed with an undercut groove 315 which is adapted for lockable engagement with a corresponding locking element 316 forming part of a lock 318, defining a socket, which includes a magnet 319. Lock 318 is here shown to be a key-operated lock, it being appreciated that any other suitable type of lock may be employed. The locking engagement between tip 314 of shaft portion 310 and locking element 316 is preferably such that without first unlocking the lock, it is impossible to remove the tip 314 from engagement with the locking element 316 without breaking the shaft portion 310.

0041Shaft portion 310 preferably includes a weakened frangible portion 320, located intermediate the sensing circuitry and transceiver portion 312 and the tip 314. Frangible portion 320 is preferably located closer to sensing circuitry and transceiver portion 312 than to tip 314 and typically has a lesser thickness than the remainder of the shaft portion 310.

0042A conductive loop 322, including a series connected reed switch 323 which is closed by magnet 319 when shaft portion 310 is in lockable engagement with lock 318, preferably extends through shaft portion 310 through to the tip 314 thereof and is configured and mounted in shaft portion 310, such that breakage of the shaft portion 310 produces a disconnection or significant change in the electrical properties of the conductive loop 322.

0043In accordance with a preferred embodiment of the present invention, sensing circuitry 324 and an RF transceiver 326 are housed within sensing circuitry and transceiver portion 312. Sensing circuitry 324 is electrically coupled to conductive loop 322 and senses the integrity thereof. Receiving an output from sensing circuitry 324 is transceiver 326, which is operative to provide transmitted information indicating whether the conductive loop 322 is intact. Conventional wireless monitoring circuitry (not shown) may be employed to receive information which is transmitted by RF transceiver 326. and indicates when the shaft portion 310 is located in lockable engagement with lock 318 and when the shaft portion 310 is separated from lock 318 due to either tampering with the seal, which results in breakage of the shaft portion 310, or disengagement of shaft portion 310 and lock 318 by using a key to unlock lock 318. It is appreciated that the provision of reed switch 323 and magnet 319 enables sensing circuitry 324 to sense when the shaft portion 310 is located in lockable engagement with lock 318 and also enables sensing circuitry 324 to sense when the shaft portion 310 is separated from lock 318 for any reason, and allows for recording of engagements and disengagements of shaft portion 310 and lock 318.

0044Reference is now made to <figref idref="f0008">Figs. 8A and 8B</figref>, which are simplified pictorial illustrations of two different types of breaks produced in the lockable electronic seal of <figref idref="f0007">Figs. 7A and 7B</figref>. As noted above, application of force to the seal of <figref idref="f0008">Figs. 8A and 8B</figref> in an attempt to separate shaft portion 310 from locking element 316 will not cause tip 314 to be disengaged from locking element 316, without first breaking the shaft portion 310. <figref idref="f0008">Fig. 8A</figref> shows such a break at a location along the shaft portion 310 which lies just above the tip 314. It is seen that this break produces a disconnection or significant change in the electrical properties of the conductive loop 322.

0045<figref idref="f0008">Fig. 8B</figref> shows such a break at the frangible portion 320 along the shaft portion 310. It is seen that this break also produces a disconnection or significant change in the electrical properties of the conductive loop 322.

0046It is appreciated that the reed switch and magnet shown in the illustrated embodiments of <figref idref="f0007 f0008">Figs. 7A - 8B</figref> can also be used in the embodiments of <figref idref="f0005 f0006">Figs. 5A - 6B</figref>.

0047Reference is now made to <figref idref="f0009">Figs. 9A and 9B</figref>, which are simplified pictorial illustrations of two stages in the assembly of a press-fit electronic seal particularly useful as tamper resistant remotely monitorable electronic seal 117 in the embodiment of <figref idref="f0004">Fig. 4</figref>.

0048As seen in <figref idref="f0009">Figs. 9A and 9B</figref>, there is provided a tamper-resistant electronic seal which preferably comprises a shaft portion 410, which is integrally formed with or fixed to a sensing circuitry and transceiver portion 412. Shaft portion 410 preferably has a generally cylindrical configuration and terminates in a press-fit tip 414, preferably formed with a series of circumferential teeth 416 which are adapted for press-fit engagement with corresponding tooth-like recesses formed in a socket 418. The press-fit engagement between tip 414 of shaft portion 410 and socket 418 is preferably such that it is impossible to remove the tip 414 from the socket 418 without breaking the shaft portion 410.

0049Shaft portion 410 preferably includes a weakened frangible portion 420, located intermediate the sensing circuitry and transceiver portion 412 and the tip 414. Frangible portion 420 is preferably located closer to sensing circuitry and transceiver portion 412 than to tip 414 and typically has a lesser thickness than the remainder of the shaft portion 410.

0050A pair of elongate conductors 422 and 424 preferably extends through shaft portion 410 through to the tip 414 thereof and is configured and mounted in shaft portion 410, such that breakage of the shaft portion 410 produces a disconnection or significant change in the electrical properties of at least one and preferably both of conductors 422 and 424. Preferably, conductors 422 and 424 communicate with respective contacts 426 and 428 which are exposed at the end of tip 414 and are arranged to electrically engage an electrical shorting contact 430 at the corresponding interior surface of socket 418 when shaft portion 410 is fully press-fit mounted into socket 418, thereby defining a conductive loop.

0051In accordance with a preferred embodiment of the present invention, sensing circuitry 432 and an RF transceiver 434 are housed within sensing circuitry and transceiver portion 412. Sensing circuitry 432 is electrically coupled to conductors 422 and 424 and senses the integrity of a conductive loop which is defined by conductors 422 and 424 when the shaft portion 410 is fully seated in socket 418. Receiving an output from sensing circuitry 432 is transceiver 434, which is operative to provide transmitted information indicating whether the conductive loop is intact. Conventional wireless monitoring circuitry (not shown) may be employed to receive information which is transmitted by RF transceiver 434 and indicates tampering with the seal which results in breakage of the shaft portion 410.

0052Reference is now made to <figref idref="f0010">Figs. 10A and 10B</figref>, which are simplified pictorial illustrations of two different types of breaks produced in the press-fit electronic seal of <figref idref="f0009">Figs. 9A and 9B</figref>. As noted above, application of force to the seal of <figref idref="f0010">Figs. 10A and 10B</figref> in an attempt to separate shaft portion 410 from socket 418 will not cause tip 414 to be disengaged from socket 418, without first breaking the shaft portion 410. <figref idref="f0010">Fig. 10A</figref> shows such a break at a location along the shaft portion 410 which lies just above the tip 414. It is seen that this break produces a disconnection or significant change in the electrical properties of the conductive loop defined by conductors 422 and 424.

0053<figref idref="f0010">Fig. 10B</figref> shows such a break at the frangible portion 420 along the shaft portion 410. It is seen that this break also produces a disconnection or significant change in the electrical properties of the conductive loop.

0054Reference is now made to <figref idref="f0011">Figs. 11A and 11B</figref>, which are simplified pictorial illustrations of two stages in the assembly of a lockable electronic seal particularly useful as tamper resistant remotely monitorable electronic seal 117 in the embodiment of <figref idref="f0004">Fig. 4</figref>.

0055As seen in <figref idref="f0011">Figs. 11A and 11B</figref>, there is provided a tamper-resistant lockable electronic seal which preferably comprises a shaft portion 510, which is integrally formed with or fixed to a sensing circuitry and transceiver portion 512. Shaft portion 510 preferably has a generally cylindrical configuration and terminates in a lockable tip 514, preferably formed with an undercut groove 515 which is adapted for lockable engagement with a corresponding locking element 516 forming part of a lock 518, defining a socket, which includes a magnet 519. Lock 518 is here shown to be a key-operated lock, it being appreciated that any other suitable type of lock may be employed. The locking engagement between tip 514 of shaft portion 510 and locking element 516 is preferably such that without first unlocking the lock, it is impossible to remove the tip 514 from engagement with the locking element 516 without breaking the shaft portion 510.

0056Shaft portion 510 preferably includes a weakened frangible portion 520, located intermediate the sensing circuitry and transceiver portion 512 and the tip 514. Frangible portion 520 is preferably located closer to sensing circuitry and transceiver portion 512 than to tip 514 and typically has a lesser thickness than the remainder of the shaft portion 510.

0057A pair of elongate conductors 522 and 524, at least one of which includes a series connected reed switch 525 which is closed by magnet 519 when shaft portion 510 is in lockable engagement with lock 518, extends through shaft portion 510 through to the tip 514 thereof and is configured and mounted in shaft portion 510, such that breakage of the shaft portion 510 produces a disconnection or significant change in the electrical properties of at least one and preferably both of conductors 522 and 524. Preferably, conductors 522 and 524 communicate with respective contacts 526 and 528 which are exposed at the end of tip 514. Contacts 526 and 528 are arranged to electrically engage an electrical shorting contact 530 at the corresponding interior surface of lock 518 when shaft portion 510 is in lockable engagement with lock 518. This electrical engagement, together with the closing of series connected reed switch 525 by magnet 519, thereby defines a conductive loop.

0058In accordance with a preferred embodiment of the present invention, sensing circuitry 532 and an RF transceiver 534 are housed within sensing circuitry and transceiver portion 512. Sensing circuitry 532 is electrically coupled to conductors 522 and 524 and senses the integrity of a conductive loop which is defined by conductors 522 and 524 when the shaft portion 510 is in lockable engagement with lock 518. Receiving an output from sensing circuitry 532 is transceiver 534, which is operative to provide transmitted information indicating whether the conductive loop is intact. Conventional wireless monitoring circuitry (not shown) may be employed to receive information which is transmitted by RF transceiver 534 and indicates when the shaft portion 510 is located in lockable engagement with lock 518 and when the shaft portion 510 is separated from lock 518 due to either tampering with the seal, which results in breakage of the shaft portion 510, or disengagement of shaft portion 510 and lock 518 by using a key to unlock lock 518. It is appreciated that the provision of reed switch 525 and magnet 519 enables sensing circuitry 532 to sense when the shaft portion 510 is located in lockable engagement with lock 518 and also enables sensing circuitry 532 to sense when the shaft portion 510 is separated from lock 518 for any reason, and allows for recording of engagements and disengagements of shaft portion 510 and lock 518.

0059Reference is now made to <figref idref="f0012">Figs. 12A and 12B</figref>, which are simplified pictorial illustrations of two different types of breaks produced in the lockable electronic seal of <figref idref="f0011">Figs. 11A and 11B</figref>. As noted above, application of force to the seal of <figref idref="f0012">Figs. 12A and 12B</figref> in an attempt to separate shaft portion 510 from locking element 516 will not cause tip 514 to be disengaged from locking element 516, without first breaking the shaft portion 510. <figref idref="f0012">Fig. 12A</figref> shows such a break at a location along the shaft portion 510 which lies just above the tip 514. It is seen that this break produces a disconnection or significant change in the electrical properties of the conductive loop defined by conductors 522 and 524.

0060<figref idref="f0012">Fig. 12B</figref> shows such a break at the frangible portion 520 along the shaft portion 510. It is seen that this break also produces a disconnection or significant change in the electrical properties of the conductive loop defined by conductors 522 and 524.

0061It is appreciated that the reed switch and magnet shown in the illustrated embodiments of <figref idref="f0011 f0012">Figs. 11A - 12B</figref> can also be used in the embodiments of <figref idref="f0009 f0010">Figs. 9A - 10B</figref>.

0062It will be appreciated by persons skilled in the art that the present invention is not limited by what has been particularly shown and described hereinabove. Rather the scope of the present invention includes both combinations and subcombinations of the various features described hereinabove as well as variations and modifications which would occur to persons skilled in the art upon reading the specification and which are not in the prior art.