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Expired European patentEurope

Method of perforating a well casing and downhole tool hanger

EP 0882869 B1 · Applicant: Halliburton Energy Services, 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 July 25, 1995 and granted September 22, 2004. A European patent lasts at most 20 years from filing, so its term ended July 25, 2015.
  • 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 25, 2021.
  • 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 25, 1995
PublishedDecember 9, 1998
GrantedSeptember 22, 2004
Term endedJuly 25, 2015
Application numberEP 98202649
Classification (CPC)E21B23/01 +2 more

Timeline

Timeline From EPO dates

1996199820002002200420062008201020122014Application filedJuly 25, 1995PublishedDec 9, 1998Patent grantedSep 22, 2004Term endedJuly 25, 2015

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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