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Expired European patentEurope

Piezoelectric transducers

EP 0025523 B1 · Applicant: Kistler Instrumente AG

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 August 20, 1980 and granted October 5, 1983. A European patent lasts at most 20 years from filing, so its term ended August 20, 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 February 20, 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.
FiledAugust 20, 1980
PublishedMarch 25, 1981
GrantedOctober 5, 1983
Term endedAugust 20, 2000
Application numberEP 80104950
Classification (CPC)H03H9/02015

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedAug 20, 1980PublishedMarch 25, 1981Patent grantedOct 5, 1983Term endedAug 20, 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.