Control for vehicular transmission retarders
CA 2123871 C · Owner: Long, Charles Francis · Inventors: Long, Charles Francis; Dadel, Martin Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A retarder control embodying the concepts of the present invention utilizes a spool valve means having a spool valve member axially translatable between an on- and an off-position. A spring means is employed to bias the spool valve member toward its off-position. A torque converter a, cooler and a retarder each have an input means and a discharge means that are ported through the spool valve means. The retarder is selectively ported to a hydraulic return means through the spool valve means and a modulating, solenoid may be employed to feed pressurized hydraulic fluid against the spool valve member not only to move the spool valve member against the spring means toward its on-position but …
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 May 18, 1994 and granted December 16, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 18, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 18, 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.