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Expired European patentEurope

Process for the recovery of practically radium-free calcium sulphate, yttrium and lanthanides

EP 0054993 B1 · Applicant: STAMICARBON B.V.

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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 December 10, 1981 and granted October 12, 1988. A European patent lasts at most 20 years from filing, so its term ended December 10, 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 June 10, 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.
FiledDecember 10, 1981
PublishedJune 30, 1982
GrantedOctober 12, 1988
Term endedDecember 10, 2001
Application numberEP 81201341
Classification (CPC)C01F11/46 +2 more

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedDec 10, 1981PublishedJune 30, 1982Patent grantedOct 12, 1988Term endedDec 10, 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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