Didactic-educational toy for elementary arythmetic operations, reading and writing
CA 2136306 A1 · Owner: Lemos Melendez, Manuel · Inventors: Lemos Melendez, Manuel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The disclosed didactic-educational toy is comprised of a series of parts or elements which are interconnected and which consist essentially of: a) rectangular plates which may be joined together by means of elongate boards carrying ten dowels distributed in two rows of five; b) thinner plates representing digital numbers from number "one", consisting of a small plate, up to number "ten" of maximum surface area, having an equal number of stepped cylindrical protuberances with axial perforation for insertion into the dowel-carrying plates; c) transparent templates having each ten circular orifices; d) assembly parts for assembling the digital plates; e) articulating parts configured like …
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 March 22, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 22, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 22, 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.