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Expired European patentEurope

Improvements in or relating to determination of far field signatures, for instance of seismic sources

EP 0047100 B1 · Applicant: THE BRITISH NATIONAL OIL CORPORATION

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Overview

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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 19, 1981 and granted August 14, 1985. A European patent lasts at most 20 years from filing, so its term ended August 19, 2001.
  • 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 19, 2007.
  • 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 19, 1981
PublishedMarch 10, 1982
GrantedAugust 14, 1985
Term endedAugust 19, 2001
Application numberEP 81303774
Classification (CPC)G01V1/04 +2 more

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedAug 19, 1981PublishedMarch 10, 1982Patent grantedAug 14, 1985Term endedAug 19, 2001

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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