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Expired European patentEurope

Method and apparatus for measuring the coefficients of adhesion and viscosity of a drilling fluid

EP 0384792 B1 · Applicant: TOTAL COMPAGNIE FRANCAISE DES PETROLES Société Anonyme

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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 23, 1990 and granted May 19, 1993. A European patent lasts at most 20 years from filing, so its term ended January 23, 2010.
  • 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 23, 2015.
  • 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 23, 1990
PublishedAugust 29, 1990
GrantedMay 19, 1993
Term endedJanuary 23, 2010
Application numberEP 90400181
Classification (CPC)E21B49/005 +1 more

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedJan 23, 1990PublishedAug 29, 1990Patent grantedMay 19, 1993Term endedJan 23, 2010

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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