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Expired European patentEurope

A process for the separation of crystalline silicates

EP 0059990 B1 · Applicant: SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.

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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 January 29, 1982 and granted March 13, 1985. A European patent lasts at most 20 years from filing, so its term ended January 29, 2002.
  • 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 July 29, 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.
FiledJanuary 29, 1982
PublishedSeptember 15, 1982
GrantedMarch 13, 1985
Term endedJanuary 29, 2002
Application numberEP 82200112
Classification (CPC)C01B33/20 +2 more

Timeline

Timeline From EPO dates

1983198519871989199119931995199719992001Application filedJan 29, 1982PublishedSep 15, 1982Patent grantedMarch 13, 1985Term endedJan 29, 2002

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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