Early car announcement
CA 2130708 C · Owner: Otis Elevator Company · Inventors: Sirag, David J. Jr.; Powell, Bruce A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In response to a registered hall call, a car announcement is made when and only when an assigned car of a plurality, has its RRT a calculated number of seconds lower than the car with the next lowest RRT to minimize actual waiting time wherein the calculation is performed as a function of the remaining response time of the assigned car, the waiting time of the passenger and an RRT inflation factor which is an amount of deviation from the minimum expected remaining response time of the assigned car.
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 August 23, 1994 and granted August 12, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 23, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 23, 2016.
- 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.