Disk brake for elevator
CA 2036363 C · Owner: Otis Elevator Company · Inventors: Sheridan, William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to an improved brake assembly for use in holding an elevator car at a landing, which is also operable to stop the car under emergency conditions, as in a power failure or overspeed. More particularly, this invention relates to a caliper brake assembly for engagement with a disk secured to the elevator machine shaft or drive sheave to hold the latter against rotation.
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 14, 1991 and granted August 24, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 14, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 14, 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.