Three dimensional puzzle
CA 2055120 C · Owner: Hrsel, Karel · Inventors: Kopsky, Vojtech; Hrsel, Karel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The three-dimensional prism puzzle includes an internal mechanism including a cylindrical body divided along a vertical axial plane into two identical portions mutually adjustable by rotation about a radially extending connecting pivot fitted centers. The prism has external exterior segments nominally grouped into three horizontally layered assemblies or structures namely a middle structure and two adjacent peripheral structures. The cylindrical body portions have at their ends radial projections for mounting exterior segments belonging to the peripheral structures, which segments are provided with complementary recesses, and the shape of these exterior segments is defined by four vertical …
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 November 7, 1991 and granted June 28, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 7, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 7, 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.