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Expired European patentEurope

Downhole fluid motor composite torque shaft

EP 0531446 B1 · Applicant: CONOCO INC.

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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 June 7, 1991 and granted August 10, 1994. A European patent lasts at most 20 years from filing, so its term ended June 7, 2011.
  • 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 December 7, 2016.
  • 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.
FiledJune 7, 1991
PublishedMarch 17, 1993
GrantedAugust 10, 1994
Term endedJune 7, 2011
Application numberEP 91911714
Classification (CPC)E21B4/02 +1 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedJune 7, 1991PublishedMarch 17, 1993Patent grantedAug 10, 1994Term endedJune 7, 2011

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.