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Expired European patentEurope

Application of silica sols for obtaining a skin called "blanc picklé stabilisé" or "blanc stabilisé"

EP 0551785 B1 · Applicant: SOCIETE FRANCAISE HOECHST Société anonyme dite:

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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 30, 1992 and granted April 5, 1995. A European patent lasts at most 20 years from filing, so its term ended December 30, 2012.
  • 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 30, 2018.
  • 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 30, 1992
PublishedJuly 21, 1993
GrantedApril 5, 1995
Term endedDecember 30, 2012
Application numberEP 92403588
Classification (CPC)C14C1/00 +1 more

Timeline

Timeline From EPO dates

1993199519971999200120032005200720092011Application filedDec 30, 1992PublishedJuly 21, 1993Patent grantedApril 5, 1995Term endedDec 30, 2012

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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