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Expired European patentEurope

High molecular weight polybenzimidazoles

EP 0095348 B1 · Applicant: CELANESE CORPORATION

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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 May 20, 1983 and granted April 9, 1986. A European patent lasts at most 20 years from filing, so its term ended May 20, 2003.
  • 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 November 20, 2008.
  • 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.
FiledMay 20, 1983
PublishedNovember 30, 1983
GrantedApril 9, 1986
Term endedMay 20, 2003
Application numberEP 83302902
Classification (CPC)C08G73/18

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedMay 20, 1983PublishedNov 30, 1983Patent grantedApril 9, 1986Term endedMay 20, 2003

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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