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Expired European patentEurope

Preparation of water soluble cationic polymer and product

EP 0176757 B1 · Applicant: POLYPURE INC.

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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 August 26, 1985 and granted November 7, 1990. A European patent lasts at most 20 years from filing, so its term ended August 26, 2005.
  • 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 February 26, 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.
FiledAugust 26, 1985
PublishedApril 9, 1986
GrantedNovember 7, 1990
Term endedAugust 26, 2005
Application numberEP 85110721
Classification (CPC)C02F1/54 +1 more

Timeline

Timeline From EPO dates

1986198819901992199419961998200020022004Application filedAug 26, 1985PublishedApril 9, 1986Patent grantedNov 7, 1990Term endedAug 26, 2005

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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