Method and apparatus for clipping polygons
CA 2010967 C · Owner: Sun Microsystems, Inc. · Inventors: Maillot, Patrick-Gilles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The improved method of clipping polygons for display on a computer output display comprising the steps of assigning a code to each vertex of a sideof a polygon the code depending on the region with respect to the window in which the vertex lies and including an indication for each vertex whether the region is above, below, to the right of or to the left of the window; testing the two vertices of each side of a polygon by means of their codes to determine the region in which they lie; accepting any side of a polygon both vertices of whichlie in the window; rejecting any side of a polygon both vertices of which lie inthe same region outside the window; applying a standard clipping algorithm …
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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 27, 1990 and granted December 1, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 2012.
- 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.