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Expired European patentEurope

Process for the chromatographic determination of ions

EP 0453604 B1 · Applicant: Hewlett-Packard GmbH

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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 April 27, 1990 and granted November 2, 1994. A European patent lasts at most 20 years from filing, so its term ended April 27, 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 October 27, 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.
FiledApril 27, 1990
PublishedOctober 30, 1991
GrantedNovember 2, 1994
Term endedApril 27, 2010
Application numberEP 90108022
Classification (CPC)B01J41/20 +2 more

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedApril 27, 1990PublishedOct 30, 1991Patent grantedNov 2, 1994Term endedApril 27, 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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