EP0246737A3

Directional coupler

Abstract

A fused tapered optical fibre directional coupler for use in a polarisation-preserving fibre system has a short stub length (4, 8) of non-polarisation-preserving fibre spliced into each fibre (2, 3, 6, 7) from which the coupler is made. The reduced diameter and tapered portions of the coupler are confined to the stub lengths since it is found that low loss coupling is not achieved if these portions are fabricated in fibre with a polarisation-preserving structure.

Term

Term ended

Projected expiry passed 20 March 2007, 19.5 years ago.

Every citation, both ways

Citations
Document	Relation	Office	Category	Cited during
EP0148569A1	Cites	European Patent Office (EPO)	AD	Search report
EP0174014A2	Cites	European Patent Office (EPO)	A	Search report
EP0191235A2	Cites	European Patent Office (EPO)	AP	Search report

11 members in 5 offices

This recordMember, by publication datePriority claim

Priority claims5

Priority claims
Document	Office	Kind	Date
8612660	United Kingdom	A	1986-05-23
8612660	United Kingdom	A	1986-05-23
8612660	United Kingdom	–	1986-05-23
8612660	–	–	–
GB19860012660	–	–	–

Members11

Family members, oldest first
Document	Office	Kind
GB8612660D0	United Kingdom	D0	1986-07-02
EP0246737A2	European Patent Office (EPO)	A2	1987-11-25
GB2190762A	United Kingdom	A	1987-11-25
JPS62280813A	Japan	A	1987-12-05
EP0246737A3This record	European Patent Office (EPO)	A3	1988-05-25
US4801185A	United States of America	A	1989-01-31
GB2190762B	United Kingdom	B	1989-12-13
EP0246737B1	European Patent Office (EPO)	B1	1992-11-11
DE3782537D1	Germany	D1	1992-12-17
DE3782537T2	Germany	T2	1993-04-08
JPH0752249B2	Japan	B2	1995-06-05

20 legal events, as 2 offices reported them to INPADOC

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Events

Legal events, newest first
	Event	Code	Office
2005-01-07	Notification of lapseLapsedST	ST	FR
2004-11-30	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2004-10-01	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2003-12-19	Transmission of propertyTP	TP	FR
2003-03-27	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
2003-03-10	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
1993-11-03	No opposition filedOpposition26N	26N	EP
1993-09-11	No opposition filed within time limitOppositionORIGINAL CODE: 0009261PLBE	PLBE	EP
1993-09-11	Information on the status of an ep patent application or granted ep patentGrantedSTATUS: NO OPPOSITION FILED WITHIN TIME LIMITSTAA	STAA	EP
1992-12-17	Corresponds to:REF	REF	EP
1992-11-27	Fr: translation filedET	ET	EP
1992-11-11	Designated contracting statesAK	AK	EP
1992-09-26	(expected) grantORIGINAL CODE: 0009210GRAA	GRAA	EP
1992-06-17	Party data changed (applicant data changed or rights of an application transferred)RAP1	RAP1	EP
1990-10-24	First examination report despatched17Q	17Q	EP
1988-07-06	Request for examination filed17P	17P	EP
1988-05-25	Designated contracting statesAK	AK	EP
1988-04-07	Search report despatchedORIGINAL CODE: 0009013PUAL	PUAL	EP
1987-11-25	Designated contracting statesAK	AK	EP
1987-10-10	Public reference made under article 153(3) epc to a published international application that has entered the european phaseORIGINAL CODE: 0009012PUAI	PUAI	EP

Directional coupler

Abstract

Term

Priority claims5

Members11

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Events

Numbers

Titles3

Classification

Designated states2