Control system for automatic transmission for vehicle
CA 2245102 C · Owner: Koyama, Hideo · Inventors: Godai, Shirou; Koyama, Hideo; Hirano, Masamitsu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It is an object of the present invention to ensure that even when slipping is generated during the upshifting from a first gear shift stage to a second gear shift stage on ice or the like a control for prohibiting the, upshifting from the second gear shift stage to a third gear shift stage can be carried out precisely. A control system is designed so that when a slipping state is detected on ice having a lower road surface friction coefficient or the like by a slipping state determining means the, upshifting of an automatic transmission from a second gear shift stage to a third gear shift stage is prohibited. In this control system the time, required for the upshifting from a first gear …
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, 1998 and granted July 9, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 17, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 17, 2020.
- 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.