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Expired European patentEurope

Wel bore recompletion

EP 0242472 B1 · Applicant: Conoco Inc.

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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 25, 1986 and granted December 20, 1989. A European patent lasts at most 20 years from filing, so its term ended April 25, 2006.
  • 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 25, 2011.
  • 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 25, 1986
PublishedOctober 28, 1987
GrantedDecember 20, 1989
Term endedApril 25, 2006
Application numberEP 86303167
Classification (CPC)E21B43/025 +2 more

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedApril 25, 1986PublishedOct 28, 1987Patent grantedDec 20, 1989Term endedApril 25, 2006

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.