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Expired European patentEurope

Methods of and apparatuses for recording and/or reproducing digital data

EP 0297809 B1 · Applicant: SONY CORPORATION

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 June 24, 1988 and granted November 11, 1992. A European patent lasts at most 20 years from filing, so its term ended June 24, 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 December 24, 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.
FiledJune 24, 1988
PublishedJanuary 4, 1989
GrantedNovember 11, 1992
Term endedJune 24, 2008
Application numberEP 88305833
Classification (CPC)G11B27/36 +2 more

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedJune 24, 1988PublishedJan 4, 1989Patent grantedNov 11, 1992Term endedJune 24, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.