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Expired European patentEurope

Method for preparing n-sulfomethyl acrylamide, acrylic acid terpolymers from polyacrylonitrile

EP 0265846 B1 · Applicant: NALCO CHEMICAL COMPANY

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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 October 22, 1987 and granted September 21, 1994. A European patent lasts at most 20 years from filing, so its term ended October 22, 2007.
  • 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 April 22, 2013.
  • 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.
FiledOctober 22, 1987
PublishedMay 4, 1988
GrantedSeptember 21, 1994
Term endedOctober 22, 2007
Application numberEP 87115509
Classification (CPC)C08F8/34

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedOct 22, 1987PublishedMay 4, 1988Patent grantedSep 21, 1994Term endedOct 22, 2007

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.