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Expired European patentEurope

Method for monitoring the operations of the rotary drilling of a well

EP 0274207 B1 · Applicant: SERVICES PETROLIERS SCHLUMBERGER

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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 November 23, 1987 and granted October 2, 1991. A European patent lasts at most 20 years from filing, so its term ended November 23, 2007.
  • 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 23, 2013.
  • 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 23, 1987
PublishedJuly 13, 1988
GrantedOctober 2, 1991
Term endedNovember 23, 2007
Application numberEP 87310316
Classification (CPC)E21B44/00 +1 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedNov 23, 1987PublishedJuly 13, 1988Patent grantedOct 2, 1991Term endedNov 23, 2007

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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