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Expired European patentEurope

Electret capacitor microphone and method for the assembly

EP 0499237 B1 · Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

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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 February 12, 1992 and granted May 10, 1995. A European patent lasts at most 20 years from filing, so its term ended February 12, 2012.
  • 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 August 12, 2017.
  • 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.
FiledFebruary 12, 1992
PublishedAugust 19, 1992
GrantedMay 10, 1995
Term endedFebruary 12, 2012
Application numberEP 92102344
Classification (CPC)H04R19/016

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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