Patents by Inventor Darrell L. Sims

Darrell L. Sims 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).

  • Progressive cavity drive train
    Patent number: 4080115
    Abstract: An improved drive train for a progressive cavity device is disclosed. The progressive cavity device has a rotor, a stator, means for fluid to enter between said stator and rotor, and means for fluid to exit therefrom. The rotor is adapted to roll with respect to the stator. The improved drive train comprises means attached to the rotor, for rotation substantially about a single axis, whereby the rolling of said rotor and the rotational motion about said single axis are directly connected and are at different speeds. At least a portion of said means attached to the rotor is aligned with the true center of the rotor.
    Type: Grant
    Filed: September 27, 1976
    Date of Patent: March 21, 1978
    Assignee: A-Z International Tool Company
    Inventors: Darrell L. Sims, Kirk R. Shirley