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Expired European patentEurope

Enhanced livingness of polymerization using silylated oxyanions

EP 0244953 B1 · Applicant: E.I. DU PONT DE NEMOURS AND COMPANY

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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 April 6, 1987 and granted July 18, 1990. A European patent lasts at most 20 years from filing, so its term ended April 6, 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 October 6, 2012.
  • 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.
FiledApril 6, 1987
PublishedNovember 11, 1987
GrantedJuly 18, 1990
Term endedApril 6, 2007
Application numberEP 87302976
Classification (CPC)C08F4/42

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedApril 6, 1987PublishedNov 11, 1987Patent grantedJuly 18, 1990Term endedApril 6, 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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