Designing a three-dimensional free-form surface
CA 2092217 C · Owner: Takezawa, Kunio · Inventors: Takezawa, Kunio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a method and an apparatus for designing a three-dimensional free-form surface, by directly manipulating points on the free-form surface under the condition , that each of, main weight functions for obtaining an equation for the free-form surface having each of, sample points as point of the surface is equal to a function obtained by , smoothing unknown virtual data by auxiliary weight functions already known said main , weight, functions are obtained for each of said sample points whereby a function , value to one of, plural sets of a first component and a second component of three-dimensional coordinate, data of said sample points is a values other than 0 and function values to , the …
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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 March 23, 1993 and granted March 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 23, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 23, 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
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.