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Expired European patentEurope

Directional microphone according to the interference principle

EP 0011817 B1 · Applicant: AKG Akustische u. Kino-Geräte Gesellschaft m.b.H.

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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, 1979 and granted July 28, 1982. A European patent lasts at most 20 years from filing, so its term ended November 21, 1999.
  • 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, 2005.
  • 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, 1979
PublishedJune 11, 1980
GrantedJuly 28, 1982
Term endedNovember 21, 1999
Application numberEP 79104634
Classification (CPC)H04R1/342

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedNov 21, 1979PublishedJune 11, 1980Patent grantedJuly 28, 1982Term endedNov 21, 1999

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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