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Expired European patentEurope

Apparatus and method for measuring the resistivity of underground formations

EP 0759563 B1 · Applicant: SCHLUMBERGER LIMITED

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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 13, 1996 and granted November 20, 2002. A European patent lasts at most 20 years from filing, so its term ended August 13, 2016.
  • 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 13, 2022.
  • 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 13, 1996
PublishedFebruary 26, 1997
GrantedNovember 20, 2002
Term endedAugust 13, 2016
Application numberEP 96305926
Classification (CPC)G01V3/20

Timeline

Timeline From EPO dates

1997199920012003200520072009201120132015Application filedAug 13, 1996PublishedFeb 26, 1997Patent grantedNov 20, 2002Term endedAug 13, 2016

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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