Calibration method for transmission control clutches
CA 2129888 C · Owner: Testerman, Michael Duane · Inventors: Testerman, Michael Duane
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A vehicle powershift transmission has a lube oil passage which communication lube oil to a clutch pack. Communication of lube oil is controlled as a function of the engagement state of the clutch pack. The hydraulic control pressure required to initially engage the clutch pack is determined or calibrated by a method wherein the lube oil pressure is monitored while the clutch control pressure is gradually increased. When the lube oil pressure reaches a certain level corresponding to clutch pack engagement the current value of, the control pressure is saved as the calibration pressure.
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 10, 1994 and granted November 3, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 10, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 10, 2016.
- 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.