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Expired European patentEurope

Method and apparatus for measuring transit time differences of ultrasonic pulses for determining flow patterns

EP 0072770 B1 · Applicant: DEUTSCHE FORSCHUNGSANSTALT FÜR LUFT- UND RAUMFAHRT e.V.

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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 11, 1982 and granted November 13, 1985. A European patent lasts at most 20 years from filing, so its term ended August 11, 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 February 11, 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.
FiledAugust 11, 1982
PublishedFebruary 23, 1983
GrantedNovember 13, 1985
Term endedAugust 11, 2002
Application numberEP 82710040
Classification (CPC)G01P5/001 +1 more

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedAug 11, 1982PublishedFeb 23, 1983Patent grantedNov 13, 1985Term endedAug 11, 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

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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