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Expired European patentEurope

Ratio detection character recognition apparatus

EP 0451252 B1 · Applicant: UNISYS CORPORATION

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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 October 23, 1990 and granted March 4, 1998. A European patent lasts at most 20 years from filing, so its term ended October 23, 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 April 23, 2016.
  • 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.
FiledOctober 23, 1990
PublishedOctober 16, 1991
GrantedMarch 4, 1998
Term endedOctober 23, 2010
Application numberEP 90916589
Classification (CPC)G06V30/2253

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedOct 23, 1990PublishedOct 16, 1991Patent grantedMarch 4, 1998Term endedOct 23, 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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