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Expired European patentEurope

Precise gradient calculation system and method for a texture mapping system of a computer graphics system

EP 0875860 B1 · Applicant: Hewlett-Packard Company

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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 9, 1997 and granted November 6, 2002. A European patent lasts at most 20 years from filing, so its term ended December 9, 2017.
  • 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 9, 2023.
  • 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 9, 1997
PublishedNovember 4, 1998
GrantedNovember 6, 2002
Term endedDecember 9, 2017
Application numberEP 97121694
Classification (CPC)G06T11/40

Timeline

Timeline From EPO dates

1998200020022004200620082010201220142016Application filedDec 9, 1997PublishedNov 4, 1998Patent grantedNov 6, 2002Term endedDec 9, 2017

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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