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Expired European patentEurope

Process and apparatus for obtaining silicon from fluosilicic acid

EP 0131586 B1 · Applicant: SRI INTERNATIONAL

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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 November 7, 1983 and granted July 31, 1991. A European patent lasts at most 20 years from filing, so its term ended November 7, 2003.
  • 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 7, 2009.
  • 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 7, 1983
PublishedJanuary 23, 1985
GrantedJuly 31, 1991
Term endedNovember 7, 2003
Application numberEP 84900157
Classification (CPC)C30B11/00 +2 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedNov 7, 1983PublishedJan 23, 1985Patent grantedJuly 31, 1991Term endedNov 7, 2003

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.