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Expired European patentEurope

High molecular weight polybenzimidazole production

EP 0122735 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 March 20, 1984 and granted November 25, 1987. A European patent lasts at most 20 years from filing, so its term ended March 20, 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 September 20, 2009.
  • 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 20, 1984
PublishedOctober 24, 1984
GrantedNovember 25, 1987
Term endedMarch 20, 2004
Application numberEP 84301877
Classification (CPC)C08G73/18

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedMarch 20, 1984PublishedOct 24, 1984Patent grantedNov 25, 1987Term endedMarch 20, 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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