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Expired European patentEurope

Method and system for printing in one or more color planes with improved control of error diffusion

EP 0474985 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 June 19, 1991 and granted September 10, 1997. A European patent lasts at most 20 years from filing, so its term ended June 19, 2011.
  • 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 December 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.
FiledJune 19, 1991
PublishedMarch 18, 1992
GrantedSeptember 10, 1997
Term endedJune 19, 2011
Application numberEP 91110102
Classification (CPC)H04N1/4052

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedJune 19, 1991PublishedMarch 18, 1992Patent grantedSep 10, 1997Term endedJune 19, 2011

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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.