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Expired European patentEurope

Methods and apparatus for controlled directional drilling of boreholes

EP 0204474 B1 · Applicant: The Analysts International S.A.

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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 May 23, 1986 and granted April 12, 1989. A European patent lasts at most 20 years from filing, so its term ended May 23, 2006.
  • 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 November 23, 2011.
  • 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.
FiledMay 23, 1986
PublishedDecember 10, 1986
GrantedApril 12, 1989
Term endedMay 23, 2006
Application numberEP 86303938
Classification (CPC)E21B7/18 +1 more

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedMay 23, 1986PublishedDec 10, 1986Patent grantedApril 12, 1989Term endedMay 23, 2006

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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