Road and traffic control system
CA 2108366 A1 · Owner: Chau, Hau Dan · Inventors: Chau, Hau Dan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A traffic control system is provided for improving the flow of traffic through an intersection. The control system utilizes traffic control signals which have only two phases and a turn lane (20) which extends from a traffic lane (16) across an oncoming lane (18) and then to the intersection so that traffic can queue up in the right turn lane (20) and make a right-hand turn when a green go signal is given without interfering with the oncoming traffic.
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 March 11, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 11, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 11, 2014.
- 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.