Apparatus for operating a school bus safety device
CA 2104260 C · Owner: Reavell, James · Inventors: Heath, Raymond; Reavell, James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A stop sign and/or crossing arm deployment system is secured to a side and/or the front, respectively of a school bus for deploying a safety stop sign and/or crossing arm between a retracted normal state and a deployed safety state. A dual power circuit is provided for providing maximum power at the instance of deployment and at the instance of final retraction. Otherwise, a lower power is used to operate a bi-directional DC motor which receives power for the entire time period between deploying and retracting the system. The system provides the lower power level while simultaneously heating the circuitry including the motor for use in cold climates. A single ground switch is used for …
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 17, 1993 and granted May 16, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 17, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 17, 2015.
- 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.