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Expired European patentEurope

Piezoelectric crystal element, and method of making the same

EP 0321438 B1 · Applicant: AVL Gesellschaft für Verbrennungskraftmaschinen und Messtechnik mbH.Prof.Dr.Dr.h.c. Hans List

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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 14, 1988 and granted January 22, 1992. A European patent lasts at most 20 years from filing, so its term ended November 14, 2008.
  • 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 14, 2014.
  • 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 14, 1988
PublishedJune 21, 1989
GrantedJanuary 22, 1992
Term endedNovember 14, 2008
Application numberEP 88890287
Classification (CPC)H10N30/853

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedNov 14, 1988PublishedJune 21, 1989Patent grantedJan 22, 1992Term endedNov 14, 2008

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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