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Expired European patentEurope

Rotary drill bit

EP 0192016 B1 · Applicant: Strata Bit Corporation

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Overview

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

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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 February 19, 1985 and granted December 28, 1988. A European patent lasts at most 20 years from filing, so its term ended February 19, 2005.
  • 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 August 19, 2010.
  • 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.
FiledFebruary 19, 1985
PublishedAugust 27, 1986
GrantedDecember 28, 1988
Term endedFebruary 19, 2005
Application numberEP 85850056
Classification (CPC)E21B10/46 +2 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedFeb 19, 1985PublishedAug 27, 1986Patent grantedDec 28, 1988Term endedFeb 19, 2005

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.