Elevator system
CA 1111973 A · Owner: Westinghouse Electric Corporation · Inventors: Kurland, Marvin; Husson, Alan L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An elevator system including a plurality of elevator cars capable of individual, independent control and a, system processor which places the plurality of elevator cars under group control. A monitor responsive to the calls for elevator service, and the resetting thereof when a call has been served, removes the elevator cars from group control to allow them to operate upon independent control when a call, for elevator service exists for a predetermined period of time during which no call resets were generated.
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
- Granted November 3, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 3, 1998.
- 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.