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Expired European patentEurope

Hydrogen peroxide stabilization in assays

EP 0393840 B1 · Applicant: CHEMTRAK, INC.

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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 March 16, 1990 and granted July 12, 1995. A European patent lasts at most 20 years from filing, so its term ended March 16, 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 September 16, 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.
FiledMarch 16, 1990
PublishedOctober 24, 1990
GrantedJuly 12, 1995
Term endedMarch 16, 2010
Application numberEP 90302845
Classification (CPC)C12Q1/28

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedMarch 16, 1990PublishedOct 24, 1990Patent grantedJuly 12, 1995Term endedMarch 16, 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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