Hand operated chain block
CA 2236731 C · Owner: Elephant Chain Block Co. Ltd. · Inventors: Kobayasi, Eikiti; Uesugi, Takasi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hand operated chain block is disclosed which is capable of fixing an end of a load chain of an unloading side and also ensuring smooth wind up and down operation of the load chain while reducing the size of chain block. In the hand operated chain block the fixing pin is located at a position in a marginal portion around each side plate such that a space between a chain split and a rotation trail of a tip of an end portion on the loading side of the first link of the load chain rotatably supported by the fixing pin can be made larger than a width of a link of the load chain and also that when a full length of the load chain of a loading side is wound down an end portion on the loading side …
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 5, 1998 and granted May 1, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 5, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 5, 2020.
- 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.