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Polymerization of 2-pyrrolidone with alkali metal pyrrolidonates and polymerization products thus obtained

EP 0032995 A2 · Applicant: Barnes, Carl Edmund

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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 January 19, 1979 and never granted as a European patent. Had it been granted, its 20-year term would have ended January 19, 1999.
  • 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 July 19, 2004.
  • 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.
FiledJanuary 19, 1979
PublishedAugust 5, 1981
GrantedNever granted
Term endedJanuary 19, 1999
Application numberEP 80107689
Classification (CPC)C08G69/24

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedJan 19, 1979PublishedAug 5, 1981Term endedJan 19, 1999

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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