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Expired European patentEurope

Method and system for reproducing monochromatic and color images using ordered dither and error diffusion

EP 0444290 B1 · Applicant: Hewlett-Packard Company

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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 December 19, 1990 and granted October 1, 1997. A European patent lasts at most 20 years from filing, so its term ended December 19, 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 June 19, 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.
FiledDecember 19, 1990
PublishedSeptember 4, 1991
GrantedOctober 1, 1997
Term endedDecember 19, 2010
Application numberEP 90124781
Classification (CPC)H04N1/52 +1 more

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedDec 19, 1990PublishedSep 4, 1991Patent grantedOct 1, 1997Term endedDec 19, 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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