Checkered board of variable shape
CA 2209040 A1 · Owner: Galperin, Efim A. · Inventors: Galperin, Efim A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
For playing chess or checkers, the fixed 64 squares checkerboard is used. In this invention a larger checkered board with specific variable geometry is proposed on which board chess and draughts games can be played according to the known classical rules, or some rules may be added or modified.
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 July 21, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 21, 2019.
- 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.