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Expired European patentEurope

Water-based compositions for sealing subterranean zones

EP 0875658 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 March 9, 1998 and granted May 14, 2003. A European patent lasts at most 20 years from filing, so its term ended March 9, 2018.
  • 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 September 9, 2023.
  • 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.
FiledMarch 9, 1998
PublishedNovember 4, 1998
GrantedMay 14, 2003
Term endedMarch 9, 2018
Application numberEP 98301719
Classification (CPC)C09K8/508

Timeline

Timeline From EPO dates

1999200120032005200720092011201320152017Application filedMarch 9, 1998PublishedNov 4, 1998Patent grantedMay 14, 2003Term endedMarch 9, 2018

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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