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Expired European patentEurope

Stabilizer for deep-drilling tools

EP 0285889 B1 · Applicant: Eastman Teleco Company

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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 March 19, 1988 and granted April 29, 1992. A European patent lasts at most 20 years from filing, so its term ended March 19, 2008.
  • 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 September 19, 2013.
  • 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.
FiledMarch 19, 1988
PublishedOctober 12, 1988
GrantedApril 29, 1992
Term endedMarch 19, 2008
Application numberEP 88104441
Classification (CPC)E21B17/1014

Timeline

Timeline From EPO dates

1989199119931995199719992001200320052007Application filedMarch 19, 1988PublishedOct 12, 1988Patent grantedApril 29, 1992Term endedMarch 19, 2008

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.