Belt hoist
CA 2209536 C · Owner: Fujiwara, Hidenori · Inventors: Fujiwara, Hidenori; Fujikawa, Masaru; Saai, Koji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
To prevent a random coil of and an overwind of a belt with simple structure, a belt hoist includes a random coil preventing member pressed against the belt wound around a winding member to prevent a random coil of the belt, the random coil preventing member being movable in response to changes in circle diameter of the belt; and control means for controlling drive of drive means in association with the random coil preventing member when the circle diameter becomes a specified diameter. Further a belt guide having a, belt guide portion is supported between two side plates in such a freely sliding manner as to allow the winding of the belt onto the winding member.
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 July 3, 1997 and granted April 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 3, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 3, 2019.
- 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.