Rotary load lifting hook device
CA 2032504 C · Owner: Sankyu Inc. · Inventors: Kameyama, Kazuhide; Chaen, Yoshinobu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rotary load lifting hook device wherein a remotely operable rotational driving device (11) is provided on a hook block (20) on which a load lifting hook (1) is positioned vertically for rotation. The rotational driving device (11) and the hook block (20) are connected to each other by means of chain wheels (12 13) provided, respectively thereon and an endless chain (14) is held in meshing engagement with the chain wheels (12, 13) so that the hook block (20) may be driven to rotate by remote operation. Rocking motion, oscillations and so forth which take place with the load lifting hook (1) when a load is lifted can be absorbed by the endless chain (14) in order that the load lifting hook …
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 May 14, 1990 and granted June 25, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 14, 2012.
- 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.