Two-way ring communication system for elevator group control
CA 1325485 C · Owner: Otis Elevator Company · Inventors: Auer, Bruno; Schlotter, Jurgen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Two-Way Ring Communication System, For Elevator Group Control Abstract, Each car controller (10) in a multicar elevator system provides two serial asynchronous full duplex I/O channels to communicate with the next and previous car controllers. These two channels allow the transmission of a message in two opposite directions (32,34) on a communications ring. A single interruption of the ring, by a interrupted transmission line or a disturbed car controller for example, guarantees the transmission of messages to each car controller in at least one of the two directions.
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 December 21, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 21, 2010.
- 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.