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Expired European patentEurope

Oil based drilling fluids suitable for drilling in the presence of acidic gases

EP 1019459 B1 · Applicant: M-I L.L.C.

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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 August 19, 1998 and granted May 9, 2007. A European patent lasts at most 20 years from filing, so its term ended August 19, 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 February 19, 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.
FiledAugust 19, 1998
PublishedJuly 19, 2000
GrantedMay 9, 2007
Term endedAugust 19, 2018
Application numberEP 98941006
Classification (CPC)C09K8/32

Timeline

Timeline From EPO dates

1999200120032005200720092011201320152017Application filedAug 19, 1998PublishedJuly 19, 2000Patent grantedMay 9, 2007Term endedAug 19, 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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