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Expired European patentEurope

Stereo microphone unit

EP 0458575 B1 · Applicant: SONY CORPORATION

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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 21, 1991 and granted August 3, 1994. A European patent lasts at most 20 years from filing, so its term ended May 21, 2011.
  • 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 21, 2016.
  • 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 21, 1991
PublishedNovember 27, 1991
GrantedAugust 3, 1994
Term endedMay 21, 2011
Application numberEP 91304550
Classification (CPC)H04S1/00 +2 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedMay 21, 1991PublishedNov 27, 1991Patent grantedAug 3, 1994Term endedMay 21, 2011

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.