Nova Patents
ATE69533T1

Identification system and transponder therefor.

Abstract

A passive integrated transponder (PIT) is attached to or embedded in an item to be identified. It is excited via an inductive coupling from an interrogator. The PIT responds to the interrogator via the inductive coupling with a signal constituting a stream of data unique to the identified item. The signal is in the form of two different frequencies, a shift from one frequency to the second during a bit cell representing a data "one", and a shift from the second frequency to the first frequency representing a data "zero". The responsive signal is then detected and processed for utilization in a data storage or display device.

Term

Term ended

Projected expiry passed 15 February 2005, 21.6 years ago.

  1. Priority
  2. Filed
  3. Published
  4. Projected expiry
  5. Today

14 members in 8 offices

This recordMember, by publication datePriority claim

Priority claims2

Priority claims
DocumentOfficeKindDate
58040184United States of AmericaA
8500232United States of AmericaW

Members14

Family members, oldest first
DocumentOfficeKind
WO8503831A1World Intellectual Property Organization (WIPO)A1
JPS60171475AJapanA
AU4062285AAustraliaA
EP0171433A1European Patent Office (EPO)A1
EP0171433A4European Patent Office (EPO)A4
US4730188AUnited States of AmericaA
CA1264840ACanadaA
US5041826AUnited States of AmericaA
EP0171433B1European Patent Office (EPO)B1
AT69533TAustriaT
ATE69533T1This recordAustriaT1
DE3584651D1GermanyD1
US5166676AUnited States of AmericaA
EP0171433B2European Patent Office (EPO)B2