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Expired European patentEurope

Process for reducing the noticeability of errors in a digital audio signal

EP 0185692 B1 · Applicant: TELEFUNKEN Fernseh und Rundfunk GmbH

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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 May 17, 1985 and granted May 3, 1989. A European patent lasts at most 20 years from filing, so its term ended May 17, 2005.
  • 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 November 17, 2010.
  • 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.
FiledMay 17, 1985
PublishedJuly 2, 1986
GrantedMay 3, 1989
Term endedMay 17, 2005
Application numberEP 85902526
Classification (CPC)H04N19/89 +2 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedMay 17, 1985PublishedJuly 2, 1986Patent grantedMay 3, 1989Term endedMay 17, 2005

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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