Dual hydrostatic drive transmission
CA 1289850 C · Owner: Dorgan, Robert John · Inventors: Wallace, David Allan; Dorgan, Robert John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hydrostatic transmission includes a, mechanically driven hydraulic pump connected in hydraulic circuit with first and second hydraulic motors. The hydrostatic outputs of the first and second motors are respectively applied to the ring and sun gears of a planetary gear set whose carrier constitutes the transmission hydrostatic output. Acceleration under low speed, high torque conditions is achieved by varying the displacements of the pump and second motor while the, first motor is removed from the hydraulic circuit and the ring gear is braked. At an appropriate shift point the, first motor is inserted into the hydraulic circuit and the ring gear is released, such that further acceleration …
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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
- Granted October 1, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 1, 2008.
- 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.