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Expired European patentEurope

Improved electrolytic cation exchange membrane

EP 0094587 B1 · Applicant: ASAHI GLASS COMPANY LTD.

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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 9, 1983 and granted November 11, 1987. A European patent lasts at most 20 years from filing, so its term ended May 9, 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 9, 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 9, 1983
PublishedNovember 23, 1983
GrantedNovember 11, 1987
Term endedMay 9, 2003
Application numberEP 83104562
Classification (CPC)C08J5/2281

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedMay 9, 1983PublishedNov 23, 1983Patent grantedNov 11, 1987Term endedMay 9, 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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