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Expired European patentEurope

Magnetic system with annular air-gap, in particular for woofers

EP 0083045 B1 · Applicant: Kort, Eckehard

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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 December 18, 1982 and granted November 21, 1985. A European patent lasts at most 20 years from filing, so its term ended December 18, 2002.
  • 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 June 18, 2008.
  • 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.
FiledDecember 18, 1982
PublishedJuly 6, 1983
GrantedNovember 21, 1985
Term endedDecember 18, 2002
Application numberEP 82111770
Classification (CPC)H04R9/025

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedDec 18, 1982PublishedJuly 6, 1983Patent grantedNov 21, 1985Term endedDec 18, 2002

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

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