Mix and match invisible ink game
CA 2050741 C · Owner: Stry-Lenkoff Company · Inventors: Landis, Thomas J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A learning association game wherein at least two series of images are visibly presented on at least one marking sheet with each of the images of one series being logically related to one of the images of the other series and with the images of each series being in different order to be selectively identified by a responding player with a marking instrument to visibly indicate indicia associated with at least one series of images the game, having a confirmation area associated therewith which includes the visible indicia and the correct invisible answers to be developed with the marking instrument.
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 September 5, 1991 and granted October 1, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 5, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 5, 2013.
- 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.