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Expired European patentEurope

Centralizer for a tool in a cased well, especially for deviated wells

EP 0125993 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 May 9, 1984 and granted July 29, 1987. A European patent lasts at most 20 years from filing, so its term ended May 9, 2004.
  • 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 November 9, 2009.
  • 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.
FiledMay 9, 1984
PublishedNovember 21, 1984
GrantedJuly 29, 1987
Term endedMay 9, 2004
Application numberEP 84400947
Classification (CPC)E21B17/1021

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedMay 9, 1984PublishedNov 21, 1984Patent grantedJuly 29, 1987Term endedMay 9, 2004

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.