Three-dimensional graphic display system
CA 2061332 A1 · Owner: Nishide, Masashi · Inventors: Nishide, Masashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
11-, THREE-DIMENSIONAL GRAPHIC DISPLAY SYSTEM ABSTRACT OF THE DISCLOSURE:, A three-dimensional graphic display system having an increased speed hidden-surface process capability. At a time when a depth buffer memory would be initialized in a conventional three-dimensional graphic display system the depth buffer memory itself is not initialized and only bits of a high-speed memory corresponding to bits to be initialized in the depth buffer memory are initialized. When a hidden-surface process is executed if the bits, of the high-speed memory have been initialized those, initialization bits are changed to a non-initialized state and the latest Z coordinate data from a line generator is …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed February 17, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 17, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.