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Expired European patentEurope

Processing method and circuit for PAL colour television signals

EP 0004457 B1 · Applicant: BRITISH BROADCASTING 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 March 21, 1979 and granted September 7, 1983. A European patent lasts at most 20 years from filing, so its term ended March 21, 1999.
  • 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 September 21, 2004.
  • 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.
FiledMarch 21, 1979
PublishedOctober 3, 1979
GrantedSeptember 7, 1983
Term endedMarch 21, 1999
Application numberEP 79300449
Classification (CPC)H04N9/78

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedMarch 21, 1979PublishedOct 3, 1979Patent grantedSep 7, 1983Term endedMarch 21, 1999

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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