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Expired European patentEurope

A transformation circuit to effect raster operations

EP 0235471 B1 · Applicant: DIGITAL EQUIPMENT 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 August 29, 1986 and granted November 24, 1993. A European patent lasts at most 20 years from filing, so its term ended August 29, 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 February 29, 2012.
  • 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.
FiledAugust 29, 1986
PublishedSeptember 9, 1987
GrantedNovember 24, 1993
Term endedAugust 29, 2006
Application numberEP 86401906
Classification (CPC)G06T3/02

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedAug 29, 1986PublishedSep 9, 1987Patent grantedNov 24, 1993Term endedAug 29, 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

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