Drawing board
CA 1163436 A · Owner: Rogers, Colin Ward · Inventors: Smith, Joseph
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A drawing board suitable for use in preparing perspective drawings is provided with a pair of arcuate guide surfaces facing towards one another and situated towards one side of the drawing board, with a recess or depression between the arcuate guide surfaces so that, a drawing instrument having projections capable of engaging the arcuate guide surfaces, can be readily moved from one arcuate guide surface to the other to enable the drawing instrument to point towards vanishing points on either side of the drawing board. The drawing board may have straight guide edges as, well as additional arcuate guide edges one of which, may be directed towards a central vanishing point. The multi-purpose …
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
- Granted March 13, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 13, 2001.
- 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.