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Expired European patentEurope

Methods of and apparatus for recording signals on a disc-shaped recording medium

EP 0238194 B1 · Applicant: SONY CORPORATION

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Overview

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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 February 12, 1987 and granted May 13, 1992. A European patent lasts at most 20 years from filing, so its term ended February 12, 2007.
  • 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 August 12, 2012.
  • 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.
FiledFebruary 12, 1987
PublishedSeptember 23, 1987
GrantedMay 13, 1992
Term endedFebruary 12, 2007
Application numberEP 87301223
Classification (CPC)G11B20/10 +2 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedFeb 12, 1987PublishedSep 23, 1987Patent grantedMay 13, 1992Term endedFeb 12, 2007

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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