Shaft conveyance system
CA 2011401 C · Owner: Eda Company Limited · Inventors: Manning, Michael John Nicholas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The mine shaft conveyance system makes use of a synchronous linear motor to drive mine conveyances up and down a shaft. The system includes spaced parallel winding support members which carry stator windings and between which a reaction member is located so as to be driven in the required direction by electromagnetic forces when current is supplied to the windings. The reaction member is flexible about at least one axis transverse to the length of the winding support members.
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 March 2, 1990 and granted May 4, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 2, 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.