Expired Canadian patentCanada
Puzzle for persons with impaired vision
CA 1188342 A · Owner: Schofield, Karen · Inventors: Schofield, Karen
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a three-dimensional puzzle having a plurality of puzzle pieces moveable relative to one another and being distinguishable by touch for determining when the pieces are in the puzzle solving position.
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 June 4, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 4, 2002.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 9, 1982
GrantedJune 4, 1985
Term endedJune 4, 2002
Patent numberCA 1188342 A
Classification (IPC)A63F9/00 +1 more
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.