Remote control traffic system
CA 2050176 A1 · Owner: Murphy, David William · Inventors: Murphy, David William; Murphy, Eugene Lloyd
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Remote Control Traffic System, Abstract of the Disclosure A remotely controllable traffic control system adapted for controlling traffic in two directions from opposite ends of a control area includes first and second portable sign structures adapted for placement at the ends of the control area. Each sign structure includes a transmitter/receiver device and a changeable sign having at least two traffic control positions including a stop position and a proceed position. A single operator control remotely positionable from the sign structures controls both the sign structures. Circuitry presents both signals from providing a simultaneous proceed indication. Upon loss of power for any reason …
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 28, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 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.