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Expired European patentEurope

Method and apparatus for measuring and correcting acoustic characteristic in sound field

EP 0165733 B1 · Applicant: PIONEER ELECTRONIC 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 May 31, 1985 and granted November 7, 1990. A European patent lasts at most 20 years from filing, so its term ended May 31, 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 December 1, 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 31, 1985
PublishedDecember 27, 1985
GrantedNovember 7, 1990
Term endedMay 31, 2005
Application numberEP 85303858
Classification (CPC)H04S7/301 +1 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedMay 31, 1985PublishedDec 27, 1985Patent grantedNov 7, 1990Term endedMay 31, 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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