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Expired European patentEurope

Tool for treating subterranean wells

EP 0372594 B1 · Applicant: SOFITECH N.V.

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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 October 27, 1989 and granted September 25, 1996. A European patent lasts at most 20 years from filing, so its term ended October 27, 2009.
  • 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 April 27, 2015.
  • 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.
FiledOctober 27, 1989
PublishedJune 13, 1990
GrantedSeptember 25, 1996
Term endedOctober 27, 2009
Application numberEP 89202713
Classification (CPC)E21B23/006 +2 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedOct 27, 1989PublishedJune 13, 1990Patent grantedSep 25, 1996Term endedOct 27, 2009

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.