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Expired European patentEurope

Process for treating alkali metal silicate particles to render them non-caking, and composition containing these particles

EP 0191518 B1 · Applicant: SOLVAY & Cie (Société Anonyme)

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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 23, 1986 and granted May 3, 1989. A European patent lasts at most 20 years from filing, so its term ended January 23, 2006.
  • 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 23, 2011.
  • 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 23, 1986
PublishedAugust 20, 1986
GrantedMay 3, 1989
Term endedJanuary 23, 2006
Application numberEP 86200101
Classification (CPC)C01B33/325

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedJan 23, 1986PublishedAug 20, 1986Patent grantedMay 3, 1989Term endedJan 23, 2006

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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