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Expired European patentEurope

Method for recovering a retrievable core receiver in upward drilling and a recovery head for this purpose

EP 0052672 B1 · Applicant: DIAMANT BOART Société Anonyme

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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 November 21, 1980 and granted March 20, 1985. A European patent lasts at most 20 years from filing, so its term ended November 21, 2000.
  • 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 May 21, 2006.
  • 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.
FiledNovember 21, 1980
PublishedJune 2, 1982
GrantedMarch 20, 1985
Term endedNovember 21, 2000
Application numberEP 80201101
Classification (CPC)E21B25/02 +2 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedNov 21, 1980PublishedJune 2, 1982Patent grantedMarch 20, 1985Term endedNov 21, 2000

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

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