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Expired European patentEurope

Methods of and apparatus for recording an information signal

EP 0246705 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 December 16, 1983 and granted November 29, 1989. A European patent lasts at most 20 years from filing, so its term ended December 16, 2003.
  • 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 June 16, 2009.
  • 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.
FiledDecember 16, 1983
PublishedNovember 25, 1987
GrantedNovember 29, 1989
Term endedDecember 16, 2003
Application numberEP 87200927
Classification (CPC)G11B5/0086 +2 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedDec 16, 1983PublishedNov 25, 1987Patent grantedNov 29, 1989Term endedDec 16, 2003

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.