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Expired European patentEurope

Process for preparing quaternary ammonium hydroxides by electrodialysis

EP 0127201 B1 · Applicant: ENICHEM SYNTHESIS S.p.A.

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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 7, 1984 and granted October 21, 1987. A European patent lasts at most 20 years from filing, so its term ended March 7, 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 7, 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 7, 1984
PublishedDecember 5, 1984
GrantedOctober 21, 1987
Term endedMarch 7, 2004
Application numberEP 84200323
Classification (CPC)C25B3/07 +1 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedMarch 7, 1984PublishedDec 5, 1984Patent grantedOct 21, 1987Term endedMarch 7, 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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