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Expired European patentEurope

Calcination process for the production of alumina from alumina trihydrate and apparatus therefor

EP 0502896 B1 · Applicant: ALCAN INTERNATIONAL LIMITED

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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 23, 1990 and granted December 29, 1993. A European patent lasts at most 20 years from filing, so its term ended November 23, 2010.
  • 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 23, 2016.
  • 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 23, 1990
PublishedSeptember 16, 1992
GrantedDecember 29, 1993
Term endedNovember 23, 2010
Application numberEP 90917380
Classification (CPC)C01F7/445 +1 more

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedNov 23, 1990PublishedSep 16, 1992Patent grantedDec 29, 1993Term endedNov 23, 2010

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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