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Expired European patentEurope

A method of determining the walk rate of a rotary drag-type drill bit

EP 1006256 B1 · Applicant: Camco International (UK) Limited

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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 December 1, 1999 and granted March 3, 2004. A European patent lasts at most 20 years from filing, so its term ended December 1, 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 June 1, 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.
FiledDecember 1, 1999
PublishedJune 7, 2000
GrantedMarch 3, 2004
Term endedDecember 1, 2019
Application numberEP 99309650
Classification (CPC)E21B7/10 +2 more

Timeline

Timeline From EPO dates

2000200220042006200820102012201420162018Application filedDec 1, 1999PublishedJune 7, 2000Patent grantedMarch 3, 2004Term endedDec 1, 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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