Blending graphics objects in a frame buffer
CA 2256786 A1 · Owner: Carlsen, Stephen E. · Inventors: Carlsen, Stephen E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Methods and apparatus that blend graphics data. In a printing device, a first object is received and rendered into a frame buffer; a second object including blending instructions is received for blending with the first object; and rendered data associated with the first object is retrieved from the frame buffer and a blend of the two objects is rendered according to a user-selectable blending algorithm. The frame buffer may be a deep frame buffer. The blended data printed may be of a bit depth reduced from that of the frame buffer. The reduced bit depth may be achieved by halftoning the blended data. The blending algorithm may be transparency, shadow, overprinting darkening, lightening, …
Read the whole patent
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 December 21, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 21, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 2020.
- 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.