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Expired European patentEurope

Method for regulating a grey scale in digital image reproduction, and apparatus for carrying out this method

EP 0204593 B1 · Applicant: GENERAL ELECTRIC CGR S.A.

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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 24, 1986 and granted August 1, 1990. A European patent lasts at most 20 years from filing, so its term ended April 24, 2006.
  • 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 24, 2011.
  • 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 24, 1986
PublishedDecember 10, 1986
GrantedAugust 1, 1990
Term endedApril 24, 2006
Application numberEP 86400909
Classification (CPC)H04N5/20 +1 more

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedApril 24, 1986PublishedDec 10, 1986Patent grantedAug 1, 1990Term endedApril 24, 2006

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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