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Expired European patentEurope

Manufacture of high molecular weight poly(N-vinylamides) and poly(vinylamines) by inverse emulsion polymerization

EP 0264649 B1 · Applicant: AIR PRODUCTS AND CHEMICALS, 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 September 23, 1987 and granted December 19, 1990. A European patent lasts at most 20 years from filing, so its term ended September 23, 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 March 23, 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.
FiledSeptember 23, 1987
PublishedApril 27, 1988
GrantedDecember 19, 1990
Term endedSeptember 23, 2007
Application numberEP 87113924
Classification (CPC)C08F8/44 +1 more

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedSep 23, 1987PublishedApril 27, 1988Patent grantedDec 19, 1990Term endedSep 23, 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

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