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Expired European patentEurope

Method of regulating the polymerization of cyclic polycarbonates

EP 0329953 B1 · Applicant: GENERAL ELECTRIC COMPANY

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Overview

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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 January 23, 1989 and granted November 17, 1994. A European patent lasts at most 20 years from filing, so its term ended January 23, 2009.
  • 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 July 23, 2014.
  • 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.
FiledJanuary 23, 1989
PublishedAugust 30, 1989
GrantedNovember 17, 1994
Term endedJanuary 23, 2009
Application numberEP 89101103
Classification (CPC)C08G64/30 +1 more

Timeline

Timeline From EPO dates

1990199219941996199820002002200420062008Application filedJan 23, 1989PublishedAug 30, 1989Patent grantedNov 17, 1994Term endedJan 23, 2009

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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