Intersection monitor
CA 1298898 C · Owner: Duncan, Gary · Inventors: Zwicky, Henry; Michael, John; Duncan, Gary
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An intersection monitor for remote monitoring of traffic intersection controllers. A central computer is connected through the public telephone system to intersection monitors one of which, is located at each remote intersection. The remote intersection monitor monitors the operation of the intersection controllers and related equipment and, upon detecting malfunctions of a preselected priority, report such malfunctions by placing calls through the public telephone system to the central computer. The central computer, by placing a call on the telephone system also, may interrogate each of the remote intersection monitors and transfer operating instructions to each monitor. Vehicle and …
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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 April 14, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 14, 2009.
- 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.