System and method for rendering bezier splines
CA 2099719 C · Owner: Microsoft Corporation · Inventors: Goossen, James Andrew; Olynyk, Kirk O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high speed and memory efficient system and method for rendering Bézier curves. The system utilizes a hybrid forward differencing function representing the Bézier, curve defined by the Bézier control points and renders the curve with a small number of, straight line segments. The system renders the curve in a manner that results in the same, Bézier control points that are calculated using the prior art recursive subdivision techniques, and rejects line segment approximations that would not be derived from recursive, subdivision. The system can start at either end of a Bézier curve and will render the same, approximation. The method is readily implemented on a computer and 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 June 29, 1993 and granted August 31, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 29, 2015.
- 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
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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.