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Expired European patentEurope

Method for using biodegradable drilling fluids

EP 1098950 B1 · Applicant: Elf Exploration Production

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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 July 20, 1999 and granted February 19, 2003. A European patent lasts at most 20 years from filing, so its term ended July 20, 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 January 20, 2025.
  • 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.
FiledJuly 20, 1999
PublishedMay 16, 2001
GrantedFebruary 19, 2003
Term endedJuly 20, 2019
Application numberEP 99932920
Classification (CPC)C09K8/34 +1 more

Timeline

Timeline From EPO dates

2000200220042006200820102012201420162018Application filedJuly 20, 1999PublishedMay 16, 2001Patent grantedFeb 19, 2003Term endedJuly 20, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.