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Expired European patentEurope

Method and apparatus for well logging using an accelerator neutron source

EP 0677754 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 April 6, 1995 and granted December 15, 2004. A European patent lasts at most 20 years from filing, so its term ended April 6, 2015.
  • 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 October 6, 2020.
  • 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.
FiledApril 6, 1995
PublishedOctober 18, 1995
GrantedDecember 15, 2004
Term endedApril 6, 2015
Application numberEP 95302295
Classification (CPC)G01V5/107

Timeline

Timeline From EPO dates

1996199820002002200420062008201020122014Application filedApril 6, 1995PublishedOct 18, 1995Patent grantedDec 15, 2004Term endedApril 6, 2015

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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