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Expired European patentEurope

Downhole force generator

EP 0477452 B1 · Applicant: HALLIBURTON COMPANY

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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 December 28, 1990 and granted September 25, 1996. A European patent lasts at most 20 years from filing, so its term ended December 28, 2010.
  • 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 June 28, 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.
FiledDecember 28, 1990
PublishedApril 1, 1992
GrantedSeptember 25, 1996
Term endedDecember 28, 2010
Application numberEP 90314380
Classification (CPC)E21B31/12 +2 more

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedDec 28, 1990PublishedApril 1, 1992Patent grantedSep 25, 1996Term endedDec 28, 2010

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.