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Expired European patentEurope

Pulsed nuclear magnetism tool for formation evaluation while drilling

EP 0581666 B1 · Applicant: SCHLUMBERGER LIMITED

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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 July 27, 1993 and granted October 1, 1997. A European patent lasts at most 20 years from filing, so its term ended July 27, 2013.
  • 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 January 27, 2019.
  • 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.
FiledJuly 27, 1993
PublishedFebruary 2, 1994
GrantedOctober 1, 1997
Term endedJuly 27, 2013
Application numberEP 93401938
Classification (CPC)G01N24/081 +1 more

Timeline

Timeline From EPO dates

1994199619982000200220042006200820102012Application filedJuly 27, 1993PublishedFeb 2, 1994Patent grantedOct 1, 1997Term endedJuly 27, 2013

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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