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Expired European patentEurope

Device for cleaning the well-bore-surrounding-zone

EP 0512331 B1 · Applicant: WAVE TEC Ges.m.b.H.

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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 April 23, 1992 and granted September 18, 1996. A European patent lasts at most 20 years from filing, so its term ended April 23, 2012.
  • 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 October 23, 2017.
  • 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.
FiledApril 23, 1992
PublishedNovember 11, 1992
GrantedSeptember 18, 1996
Term endedApril 23, 2012
Application numberEP 92106953
Classification (CPC)E21B37/00 +2 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedApril 23, 1992PublishedNov 11, 1992Patent grantedSep 18, 1996Term endedApril 23, 2012

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.