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Expired European patentEurope

A method for the underground gasification of coal or browncoal

EP 0053418 B1 · Applicant: Grupping, Arnold Willem Josephus, Prof.Ir.

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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 20, 1981 and granted April 3, 1985. A European patent lasts at most 20 years from filing, so its term ended November 20, 2001.
  • 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 20, 2007.
  • 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 20, 1981
PublishedJune 9, 1982
GrantedApril 3, 1985
Term endedNovember 20, 2001
Application numberEP 81201289
Classification (CPC)E21B43/295 +2 more

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedNov 20, 1981PublishedJune 9, 1982Patent grantedApril 3, 1985Term endedNov 20, 2001

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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