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Expired European patentEurope

Method for phase controlled power- and frequency adjustement of an ultrasonic transducer and apparatus for application of the method

EP 0254237 B1 · Applicant: Gässler, Herbert

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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 18, 1987 and granted September 21, 1994. A European patent lasts at most 20 years from filing, so its term ended July 18, 2007.
  • 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 18, 2013.
  • 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 18, 1987
PublishedJanuary 27, 1988
GrantedSeptember 21, 1994
Term endedJuly 18, 2007
Application numberEP 87110425
Classification (CPC)B06B1/0253

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedJuly 18, 1987PublishedJan 27, 1988Patent grantedSep 21, 1994Term endedJuly 18, 2007

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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