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Expired European patentEurope

Rotary drill bit for drilling through sticky formations

EP 0365100 B1 · Applicant: SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.

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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 October 18, 1989 and granted January 5, 1994. A European patent lasts at most 20 years from filing, so its term ended October 18, 2009.
  • 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 April 18, 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.
FiledOctober 18, 1989
PublishedApril 25, 1990
GrantedJanuary 5, 1994
Term endedOctober 18, 2009
Application numberEP 89202639
Classification (CPC)E21B10/602

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedOct 18, 1989PublishedApril 25, 1990Patent grantedJan 5, 1994Term endedOct 18, 2009

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.