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Expired European patentEurope

Amine-modified polyimide membranes

EP 0401005 B1 · Applicant: E.I. DU PONT DE NEMOURS AND 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 May 31, 1990 and granted December 28, 1994. A European patent lasts at most 20 years from filing, so its term ended May 31, 2010.
  • 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 December 1, 2015.
  • 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 31, 1990
PublishedDecember 5, 1990
GrantedDecember 28, 1994
Term endedMay 31, 2010
Application numberEP 90305901
Classification (CPC)C08G73/1046 +2 more

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedMay 31, 1990PublishedDec 5, 1990Patent grantedDec 28, 1994Term endedMay 31, 2010

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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