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Expired European patentEurope

Method and composition for thickening or stabilizing aqueous media with polyamphoteric polysaccharides

EP 0339372 B1 · Applicant: National Starch and Chemical Investment Holding 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 April 12, 1989 and granted January 31, 1996. A European patent lasts at most 20 years from filing, so its term ended April 12, 2009.
  • 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 October 12, 2014.
  • 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.
FiledApril 12, 1989
PublishedNovember 2, 1989
GrantedJanuary 31, 1996
Term endedApril 12, 2009
Application numberEP 89106519
Classification (CPC)C09K3/00 +2 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedApril 12, 1989PublishedNov 2, 1989Patent grantedJan 31, 1996Term endedApril 12, 2009

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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