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Expired European patentEurope

Apparatus for use in the seismic exploration of the sea for the receipt of seismic signals and their transmission to a central control and recording system

EP 0228932 B1 · Applicant: INSTITUT FRANCAIS DU PETROLE

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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 21, 1986 and granted September 20, 1989. A European patent lasts at most 20 years from filing, so its term ended November 21, 2006.
  • 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 21, 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.
FiledNovember 21, 1986
PublishedJuly 15, 1987
GrantedSeptember 20, 1989
Term endedNovember 21, 2006
Application numberEP 86402589
Classification (CPC)G01V1/22

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedNov 21, 1986PublishedJuly 15, 1987Patent grantedSep 20, 1989Term endedNov 21, 2006

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

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