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Expired European patentEurope

Process for the preparation of polyisocyanates with a biuret structure

EP 0259233 B1 · Applicant: RHONE-POULENC CHIMIE

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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 July 10, 1987 and granted September 25, 1991. A European patent lasts at most 20 years from filing, so its term ended July 10, 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 January 10, 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.
FiledJuly 10, 1987
PublishedMarch 9, 1988
GrantedSeptember 25, 1991
Term endedJuly 10, 2007
Application numberEP 87420196
Classification (CPC)C07C273/1809

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedJuly 10, 1987PublishedMarch 9, 1988Patent grantedSep 25, 1991Term endedJuly 10, 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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