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Expired European patentEurope

Method and novel catalyst compositions for preparing polyorganosiloxanes

EP 0133975 B1 · Applicant: DOW CORNING 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 July 28, 1984 and granted November 23, 1988. A European patent lasts at most 20 years from filing, so its term ended July 28, 2004.
  • 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 28, 2010.
  • 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 28, 1984
PublishedMarch 13, 1985
GrantedNovember 23, 1988
Term endedJuly 28, 2004
Application numberEP 84108962
Classification (CPC)C08G77/44 +2 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedJuly 28, 1984PublishedMarch 13, 1985Patent grantedNov 23, 1988Term endedJuly 28, 2004

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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