Enhanced computer aided design system
CA 2055545 A1 · Owner: Chen, Liangpin · Inventors: Chen, Liangpin; Niu, Xingzhang Frank
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed herein is a design system for designing, dynamically changing and displaying design drawings. The invention allows a user to select a solid object from a display as the current, active object. The user then selects a first, parent face by selecting any point on a face of the solid object. Next, the user is prompted to select another point on a line of another face parallel to the first face. This operation defines the first offset face which is a variable distance from the first parent face. Subsequently the user selects a point on a line, to define a second parent face of the solid object. Then, the user selects a point on a line parallel to the second parent face. This defines …
Read the whole patent
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 November 14, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 14, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 14, 2013.
- 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.