Educational system for teaching counting and equation solving strategies
CA 2017482 C · Owner: Pocius, Frank · Inventors: Pocius, Frank
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention encompasses teaching kits for mathematics and a set of cooperating cards for use with the kits. A single surface displaying manipulable elements arranged on the surface is used to teach concepts of counting denominate units and evaluating expressions. Two surfaces displaying manipulable elements arranged on each surface simulate a linear equation. Four surfaces displaying manipulable elements arranged on each surface simulate a system of two linear equations. The elements are distinguishable by physical features in such a way that typically as many as three distinct denominate units are displayed with both positive and negative representations. The invention can be extended, …
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 24, 1990 and granted May 7, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 24, 2012.
- 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.