A hydraulic control system for automatic transmission
CA 2136867 C · Owner: Park, Dong H. · Inventors: Park, Dong H.; Lim, Ki B.; Jang, Jae D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a hydraulic control system for an automatic transmission, including: an oil pump; a plurality of shift valves for controlling a friction means in accordance with a vehicle's speed and transmitting a torque of a torque converter to a gear of a multi-stage transmission gear mechanism; a manual valve for selectively supplying the hydraulic pressure generated from the oil pump to each shift valve by changing ports thereof; a reducing valve for regulating the hydraulic pressure to be lower than a line pressure; a pressure regulating valve for receiving a control pressure and changing the line pressure; a rear clutch exhaust valve for directly supplying …
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 29, 1993 and granted June 8, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 29, 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.