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Expired European patentEurope

Optical recording medium with different optical absorption of the two recording layers

EP 1686574 B1 · Applicant: Ricoh Company, Ltd.

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Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Filed January 31, 2005 and granted March 4, 2009. A European patent lasts at most 20 years from filing, so its term ended January 31, 2025.
  • Supplementary protection certificates extend only medicine and crop-protection patents, and it isn't classified as either.
  • We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledJanuary 31, 2005
PublishedAugust 2, 2006
GrantedMarch 4, 2009
Term endedJanuary 31, 2025
Application numberEP 05001968
Classification (CPC)G11B7/26 +2 more

Timeline

Timeline From EPO dates

2006200820102012201420162018202020222024Application filedJan 31, 2005PublishedAug 2, 2006Patent grantedMarch 4, 2009Term endedJan 31, 2025

Sources & verification

Official EPO records

Full published documentClaims, description and drawings as a PDF.EPOEuropean Patent RegisterProcedure, status, file inspection and legal events.EPOLinked open EP data recordThe bibliographic record this page is built from.EPO

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Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comEspacenetNational family members and their legal status.European Patent Office

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