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Expired European patentEurope

Method of making an electrodynamic transducer

EP 0023007 B1 · Applicant: Telefonbau und Normalzeit GmbH

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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 July 14, 1980 and granted December 15, 1982. A European patent lasts at most 20 years from filing, so its term ended July 14, 2000.
  • 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 January 14, 2006.
  • 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.
FiledJuly 14, 1980
PublishedJanuary 28, 1981
GrantedDecember 15, 1982
Term endedJuly 14, 2000
Application numberEP 80104067
Classification (CPC)H04R9/00 +1 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedJuly 14, 1980PublishedJan 28, 1981Patent grantedDec 15, 1982Term endedJuly 14, 2000

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.