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Expired European patentEurope

Anti-accretion additives for drilling fluids

EP 1056817 B1 · Applicant: COMPAGNIE DES SERVICES DOWELL SCHLUMBERGER S.A.

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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 January 28, 1999 and granted January 10, 2007. A European patent lasts at most 20 years from filing, so its term ended January 28, 2019.
  • 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 July 28, 2024.
  • 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.
FiledJanuary 28, 1999
PublishedDecember 6, 2000
GrantedJanuary 10, 2007
Term endedJanuary 28, 2019
Application numberEP 99902695
Classification (CPC)C09K8/22

Timeline

Timeline From EPO dates

2000200220042006200820102012201420162018Application filedJan 28, 1999PublishedDec 6, 2000Patent grantedJan 10, 2007Term endedJan 28, 2019

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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