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Expired European patentEurope

Gel based on water-soluble poly(meth)acrylic acid derivatives, process for its preparation and its use

EP 0034331 B1 · Applicant: Chemische Fabrik Stockhausen GmbH

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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 February 11, 1981 and granted November 14, 1984. A European patent lasts at most 20 years from filing, so its term ended February 11, 2001.
  • 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 August 11, 2006.
  • 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.
FiledFebruary 11, 1981
PublishedAugust 26, 1981
GrantedNovember 14, 1984
Term endedFebruary 11, 2001
Application numberEP 81100958
Classification (CPC)C08F8/44

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedFeb 11, 1981PublishedAug 26, 1981Patent grantedNov 14, 1984Term endedFeb 11, 2001

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.