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Expired European patentEurope

Device for drilling wells with lateral branches

EP 0244317 B1 · Applicant: SOCIETE NATIONALE ELF AQUITAINE (PRODUCTION)

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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 April 27, 1987 and granted January 11, 1989. A European patent lasts at most 20 years from filing, so its term ended April 27, 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 October 27, 2012.
  • 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 27, 1987
PublishedNovember 4, 1987
GrantedJanuary 11, 1989
Term endedApril 27, 2007
Application numberEP 87400968
Classification (CPC)E21B17/00 +2 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedApril 27, 1987PublishedNov 4, 1987Patent grantedJan 11, 1989Term endedApril 27, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.