Patent Yard Sign in
Expired European patentEurope

Method and apparatus for controlling the direction of a down-hole percussion drilling tool

EP 0247767 B1 · Applicant: GAS RESEARCH INSTITUTE

EPO PDF

Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed May 15, 1987 and granted December 2, 1992. A European patent lasts at most 20 years from filing, so its term ended May 15, 2007.
  • 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 15, 2012.
  • 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 15, 1987
PublishedDecember 2, 1987
GrantedDecember 2, 1992
Term endedMay 15, 2007
Application numberEP 87304342
Classification (CPC)E21B7/26 +2 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedMay 15, 1987PublishedDec 2, 1987Patent grantedDec 2, 1992Term endedMay 15, 2007

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.