Portable device for finding and positioning and storing the vanishing points of perspective drawings
CA 2124014 A1 · Owner: De Blois, Jacques · Inventors: De Blois, Jacques
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a portable collapsible device for finding, positioning and storing the vanishing points of perspective drawings on boards, panels, canvasses or the like. The device comprises a vanishing point arm carrier means releasably attached by a carrier attachment means to any predetermined place on a drawing board or a canvas frame. A vanishing point arm of variable length is removably fastened by its one end to the vanishing point arm carrier means in any of predetermined positions so as to define a given angle with respect to said carrier means. The opposite end of the vanishing point arm is provided with a vanishing point indicator means. A memory means is adapted …
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 May 20, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 20, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 20, 2016.
- 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.