Shaft conveyance system
CA 2037352 C · Owner: Eda Company Limited · Inventors: Sobey, Bruce Alexander; Greenway, Malcolm Ernest
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The shaft conveyance system comprises a vertical shaft 10 shaft conveyances , 18 and, means 20 for moving the conveyances up and down the shaft pairs or groups of , the, conveyances being connectable together in side-by-side relationship so as to move, up or down the shaft together. The shaft is typically a mine shaft. The conveyances, may be driven by linear motors.
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 February 28, 1991 and granted December 12, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 28, 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.