Patents by Inventor Joseph D. Doll

Joseph D. Doll 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).

  • Over-power safety device for motor driven system
    Patent number: 4242712
    Abstract: A safety device and method for detecting over-power conditions on the chassis of a motor driven system interrupts energization of the system when the voltage differential between the system chassis and earth ground exceeds a selected value. The device is especially beneficial for systems utilizing multi-phase induction motors in which current sensing safety devices cannot effectively detect all over-power conditions. The safety device utilizes a fuse and a motor control relay such that, upon the occurrence of the over-power condition, the fuse is rendered non-conductive, opening the motor control relay.
    Type: Grant
    Filed: October 12, 1978
    Date of Patent: December 30, 1980
    Assignee: Lockwood Corporation
    Inventor: Joseph D. Doll
  • Over-power safety device for motor driven system
    Patent number: 4138705
    Abstract: A safety device and method for detecting over-power conditions on the chassis of a motor driven system interrupts energization of the system when the voltage differential between the system chassis and earth ground exceeds a selected value. The device is especially beneficial for systems utilizing multi-phase induction motors in which current sensing safety devices cannot effectively detect all over-power conditions. The safety device utilizes a fuse and a motor control relay such that, upon the occurrence of the over-power condition, the fuse is rendered non-conductive, opening the motor control relay.
    Type: Grant
    Filed: April 22, 1977
    Date of Patent: February 6, 1979
    Assignee: Lockwood Corporation
    Inventor: Joseph D. Doll