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Expired European patentEurope

Method and apparatus for removing gelled drilling fluid and filter cake from the side of a well bore

EP 0754836 B1 · Applicant: HALLIBURTON COMPANY

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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 18, 1996 and granted February 26, 2003. A European patent lasts at most 20 years from filing, so its term ended July 18, 2016.
  • 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 18, 2022.
  • 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 18, 1996
PublishedJanuary 22, 1997
GrantedFebruary 26, 2003
Term endedJuly 18, 2016
Application numberEP 96305287
Classification (CPC)E21B37/00 +1 more

Timeline

Timeline From EPO dates

1997199920012003200520072009201120132015Application filedJuly 18, 1996PublishedJan 22, 1997Patent grantedFeb 26, 2003Term endedJuly 18, 2016

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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