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Expired European patentEurope

Method of delaying the setting time of crosslinked lost circulation control pills

EP 1661555 B1 · Applicant: Texas United Chemical Company, LLC.

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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 November 29, 2005 and granted April 18, 2012. A European patent lasts at most 20 years from filing, so its term ended November 29, 2025.
  • Supplementary protection certificates extend only medicine and crop-protection patents, and it isn't classified as either.
  • 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.
FiledNovember 29, 2005
PublishedMay 31, 2006
GrantedApril 18, 2012
Term endedNovember 29, 2025
Application numberEP 05257340
Classification (CPC)C09K8/887 +1 more

Timeline

Timeline From EPO dates

2006200820102012201420162018202020222024Application filedNov 29, 2005PublishedMay 31, 2006Patent grantedApril 18, 2012Term endedNov 29, 2025

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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