Transmission ratio control system for a continuously variable transmission
CA 2005397 C · Owner: Miyawaki, Motohisa · Inventors: Miyawaki, Motohisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A continuously variable transmission for a motor vehicle has a drive pulley, a driven pulley a belt engaged, with both the pulleys, a hydraulic circuit having a pump for supplying oil to hydraulic cylinders of both the pulleys and a transmission ratio control valve having a spool slidably mounted in a valve body for controlling the oil supplied to the cylinder of the drive pulley to change the transmission ratio. The locking of wheels of the vehicle at braking the vehicle is detected, and the releasing of the locked wheels is detected. The transmission ratio is held at the detected locking of the wheel. And the held transmission ratio is released when the releasing of the locked wheels is …
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 December 13, 1989 and granted January 18, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 13, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 13, 2011.
- 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.