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Expired European patentEurope

Nonlinear signal processing in a speech recognition system

EP 0179280 B1 · Applicant: International Business Machines Corporation

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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 20, 1985 and granted April 25, 1990. A European patent lasts at most 20 years from filing, so its term ended September 20, 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 March 20, 2011.
  • 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 20, 1985
PublishedApril 30, 1986
GrantedApril 25, 1990
Term endedSeptember 20, 2005
Application numberEP 85111905
Classification (CPC)G10L25/00

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedSep 20, 1985PublishedApril 30, 1986Patent grantedApril 25, 1990Term endedSep 20, 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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