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Expired European patentEurope

Use of near infrared sensitive chromophores in optical recording media

EP 0275161 B1 · Applicant: HOECHST CELANESE CORPORATION

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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 11, 1988 and granted July 3, 1991. A European patent lasts at most 20 years from filing, so its term ended January 11, 2008.
  • A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by July 11, 2013.
  • 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 11, 1988
PublishedJuly 20, 1988
GrantedJuly 3, 1991
Term endedJanuary 11, 2008
Application numberEP 88300176
Classification (CPC)G11B7/244 +1 more

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedJan 11, 1988PublishedJuly 20, 1988Patent grantedJuly 3, 1991Term endedJan 11, 2008

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

Cross-check elsewhere

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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