Patents by Inventor Robert S. Yum

Robert S. Yum has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Differential transmission with limited torque transmitter
    Patent number: 4258588
    Abstract: A differential transmission including a rotatable casing, a pair of pinion gears coupled to the casing, a pair of side gears engaged with the pinion gears, a pair of wheel axles engaged with the side gears, and a limited torque transmitter, in the form of a rotary pump, which pumps the transmission fluid. The torque transmitter develops internal torsional resistance only when the differential speed ratio of the axles exceeds a predetermined value, such as when one wheel slips.
    Type: Grant
    Filed: March 16, 1979
    Date of Patent: March 31, 1981
    Inventor: Robert S. Yum