System and method for drawing an elliptical arc
CA 2475832 A1 · Owner: Steed, Arnold, F. · Inventors: Steed, Arnold, F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An interactive elliptical arc control system and method are disclosed. Three control points are provided - a center control point and two foci control points - that a user can interactively manipulate in order to specify and change the elliptical parameters involved. The center control point can control the radius of the ellipse in the x direction while keeping constant , the ratio of the radius of the ellipse in the y direction to the radius of the ellipse in the x direction. The center control point can also control the relationship of the sweep flag to the large arc flag involved. The two foci control points can control the ratio of the radius of the ellipse in the y direction to …
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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 14, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 14, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 14, 2025.
- 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.