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Expired European patentEurope

Impregnated polymerization catalyst and process for preparing it

EP 0091135 B1 · Applicant: UNION CARBIDE CORPORATION

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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 March 30, 1979 and granted March 4, 1992. A European patent lasts at most 20 years from filing, so its term ended March 30, 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 September 30, 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.
FiledMarch 30, 1979
PublishedOctober 12, 1983
GrantedMarch 4, 1992
Term endedMarch 30, 1999
Application numberEP 83103458
Classification (CPC)C08F210/16

Timeline

Timeline From EPO dates

1980198219841986198819901992199419961998Application filedMarch 30, 1979PublishedOct 12, 1983Patent grantedMarch 4, 1992Term endedMarch 30, 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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