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European application, no grantEurope

Method of determining a safe value of density for a drilling fluid

EP 0278616 A2 · Applicant: SERVICES PETROLIERS SCHLUMBERGER

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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 January 25, 1988 and never granted as a European patent. Had it been granted, its 20-year term would have ended January 25, 2008.
  • 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 25, 2013.
  • 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 25, 1988
PublishedAugust 17, 1988
GrantedNever granted
Term endedJanuary 25, 2008
Application numberEP 88300564
Classification (CPC)G01N9/00 +1 more

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedJan 25, 1988PublishedAug 17, 1988Term endedJan 25, 2008

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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