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Expired European patentEurope

Treatment of clays with cationic polymers to prepare high bulking pigments

EP 0245553 B1 · Applicant: ENGELHARD CORPORATION

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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 July 2, 1986 and granted February 16, 1994. A European patent lasts at most 20 years from filing, so its term ended July 2, 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 January 2, 2012.
  • 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.
FiledJuly 2, 1986
PublishedNovember 19, 1987
GrantedFebruary 16, 1994
Term endedJuly 2, 2006
Application numberEP 86305151
Classification (CPC)D21H19/40 +2 more

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedJuly 2, 1986PublishedNov 19, 1987Patent grantedFeb 16, 1994Term endedJuly 2, 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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