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Expired European patentEurope

Apparatus and method for electrodialytic treatment of salts to produce acid and/or base of improved purity

EP 0561942 B1 · Applicant: AlliedSignal Inc.

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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 November 19, 1991 and granted September 21, 1994. A European patent lasts at most 20 years from filing, so its term ended November 19, 2011.
  • 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 May 19, 2017.
  • 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.
FiledNovember 19, 1991
PublishedSeptember 29, 1993
GrantedSeptember 21, 1994
Term endedNovember 19, 2011
Application numberEP 92901241
Classification (CPC)B01D61/445

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedNov 19, 1991PublishedSep 29, 1993Patent grantedSep 21, 1994Term endedNov 19, 2011

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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