Braking apparatus
CA 2037231 C · Owner: Eda Company Limited · Inventors: Manning, Michael John Nicholas; Pink, Edwin George
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The braking apparatus is provided for a shaft conveyance system in which a conveyance 18 is driven up and down an upright track 20 in the shaft 10. The braking apparatus comprises a brake 22 associated with the conveyance 18 which is operable to engage a counter-member 16 in the shaft 10 to hold the conveyance, 18 at a chosen elevation on the track 20. A load cell 34 is provided for sensing the, vertical load on the brake when it is engaged with the counter-member. Also provided are means operable in response to the load cell to disengage the brake, from the counter-member when the load cell senses a predetermined load on the brake.
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 27, 1991 and granted February 5, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 27, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 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.