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Expired European patentEurope

Removal of catalyst remnants from ethene/CO copolymers

EP 0227135 B1 · Applicant: SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.

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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 November 14, 1986 and granted July 24, 1991. A European patent lasts at most 20 years from filing, so its term ended November 14, 2006.
  • 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 May 14, 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.
FiledNovember 14, 1986
PublishedJuly 1, 1987
GrantedJuly 24, 1991
Term endedNovember 14, 2006
Application numberEP 86202008
Classification (CPC)C08G67/02 +1 more

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedNov 14, 1986PublishedJuly 1, 1987Patent grantedJuly 24, 1991Term endedNov 14, 2006

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

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