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Expired European patentEurope

Method for the determination of the air speed of a helicopter, system for applying it, calibration method for this method and system for the determination of the air speed

EP 0283626 B1 · Applicant: SEXTANT Avionique

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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 May 29, 1987 and granted August 21, 1991. A European patent lasts at most 20 years from filing, so its term ended May 29, 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 November 29, 2012.
  • 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.
FiledMay 29, 1987
PublishedSeptember 28, 1988
GrantedAugust 21, 1991
Term endedMay 29, 2007
Application numberEP 87401211
Classification (CPC)G01P7/00 +2 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedMay 29, 1987PublishedSep 28, 1988Patent grantedAug 21, 1991Term endedMay 29, 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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