Patent Yard Sign in
Expired European patentEurope

Production of high molecular weight polybenzimidazoles

EP 0115944 B1 · Applicant: CELANESE CORPORATION

EPO PDF

Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

Read the whole patent

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.

Google PatentsEPO PDF

Why it's free to use

  • Filed January 26, 1984 and granted November 23, 1988. A European patent lasts at most 20 years from filing, so its term ended January 26, 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 July 26, 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.
FiledJanuary 26, 1984
PublishedAugust 15, 1984
GrantedNovember 23, 1988
Term endedJanuary 26, 2004
Application numberEP 84300482
Classification (CPC)C08G73/18

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedJan 26, 1984PublishedAug 15, 1984Patent grantedNov 23, 1988Term endedJan 26, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.