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Expired European patentEurope

Method of producing electroacoustic converters, preferably microphones, and converters produced according to the method

EP 0147373 B1 · Applicant: TELEFONAKTIEBOLAGET L M ERICSSON

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Overview

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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 November 21, 1984 and granted May 13, 1987. A European patent lasts at most 20 years from filing, so its term ended November 21, 2004.
  • 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 May 21, 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.
FiledNovember 21, 1984
PublishedJuly 3, 1985
GrantedMay 13, 1987
Term endedNovember 21, 2004
Application numberEP 84850359
Classification (CPC)H04R31/006 +1 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedNov 21, 1984PublishedJuly 3, 1985Patent grantedMay 13, 1987Term endedNov 21, 2004

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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