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EP 0074841 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 September 13, 1982 and granted December 27, 1990. A European patent lasts at most 20 years from filing, so its term ended September 13, 2002.
  • 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 March 13, 2008.
  • 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.
FiledSeptember 13, 1982
PublishedMarch 23, 1983
GrantedDecember 27, 1990
Term endedSeptember 13, 2002
Application numberEP 82304820
Classification (CPC)G11B27/031 +2 more

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedSep 13, 1982PublishedMarch 23, 1983Patent grantedDec 27, 1990Term endedSep 13, 2002

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.