Curve generation in a display system
CA 1309523 C · Owner: International Business Machines Corporation · Inventors: Clark, David Andrew; Farr, Robert William Eric
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A curve generator for a display system comprises arc generation means for generating an arc of a circle from data defining the locations of two end points and an intermediate point on the arc. The arc generation means comprises initialisation means for calculating the angle subtended between a first vector, from a first of the end points to the intermediate point and a second vector from the second of the end points to the intermediate point and arc plotting means for defining a succession of further vectors from said first end point and for calculating, for each further vector, its point of intersection with a counterpart vector from the second end point, with which it subtends said angle, …
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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
- Granted October 27, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 27, 2009.
- 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.