EP0446892A3

Optical data medium recording method

Abstract

Before a signal is recorded to an optical disk (2), irradiations are made (B) with plural light irradiation conditions of variable irradiation power or pulse width, optical conditions of irradiated portions are detected (C) by detecting changes, in the reflectivity or transmissivity or errors, and the optimum irradiation conditions are determined by comparing (3) the detected results and the light irradiation conditions. In particular, by determining the optimum irradiation conditions in reference to the point where the change in reflectivity or transmissivity is greatest with respect to changes in the irradiation power, the light irradiation conditions can be determined in a short time.

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Term ended

Projected expiry passed 13 March 2011, 15.5 years ago.

Every citation, both ways

Citations
Document	Relation	Office	Category	Cited during
EP0265849A2	Cites	European Patent Office (EPO)	A	Search report
EP0288114A1	Cites	European Patent Office (EPO)	A	Search report
EP0289004A2	Cites	European Patent Office (EPO)	A	Search report
EP0319102A1	Cites	European Patent Office (EPO)	X	Search report
US4821254A	Cites	United States of America	X	Search report

3 priority claims, no other members on record

This recordMember, by publication datePriority claim

Priority claims3

Priority claims
Document	Office	Kind	Date
6316690	Japan	–	1990-03-14
6316690	Japan	A	1990-03-14
JP19900063166	–	–	–

27 legal events, as 4 offices reported them to INPADOC

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	Event	Code	Office
2013-06-28	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2011-07-29	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2011-05-31	Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25	PG25	EP
2011-04-06	Patent expired after termination of 20 yearsExpiredPE20	PE20	GB
2011-03-23	Discontinued because of reaching the maximum lifetime of a patentV4	V4	NL
2011-03-13	Expiry of rightR071	R071	DE
2010-08-31	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
2010-08-31	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
2010-06-30	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
2010-05-31	Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP	PGFP	EP
2002-01-01	European patent in force as of 2002-01-01IF02	IF02	GB
1998-05-27	No opposition filedOpposition26N	26N	EP
1998-04-09	No opposition filed within time limitOppositionORIGINAL CODE: 0009261PLBE	PLBE	EP
1998-04-09	Information on the status of an ep patent application or granted ep patentGrantedSTATUS: NO OPPOSITION FILED WITHIN TIME LIMITSTAA	STAA	EP
1997-07-11	Fr: translation filedET	ET	EP
1997-07-10	Corresponds to:REF	REF	EP
1997-06-04	Designated contracting statesAK	AK	EP
1997-04-18	(expected) grantORIGINAL CODE: 0009210GRAA	GRAA	EP
1996-12-20	Despatch of communication of intention to grant a patentORIGINAL CODE: EPIDOS IGRAGRAH	GRAH	EP
1996-09-11	Despatch of communication of intention to grant a patentORIGINAL CODE: EPIDOS IGRAGRAH	GRAH	EP
1996-05-24	Despatch of communication of intention to grantORIGINAL CODE: EPIDOS AGRAGRAG	GRAG	EP
1995-09-06	First examination report despatched17Q	17Q	EP
1992-12-16	Designated contracting statesAK	AK	EP
1992-10-23	Search report despatchedORIGINAL CODE: 0009013PUAL	PUAL	EP
1991-09-18	Request for examination filed17P	17P	EP
1991-09-18	Designated contracting statesAK	AK	EP
1991-08-02	Public reference made under article 153(3) epc to a published international application that has entered the european phaseORIGINAL CODE: 0009012PUAI	PUAI	EP

Optical data medium recording method

Abstract

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