Patents by Inventor Marvin L. Colmer

Marvin L. Colmer 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).

  • Submersible thrust limit switch
    Patent number: 4057365
    Abstract: A submersible thrust limit switch is mounted between the motor and the pump, thus detecting any predetermined drop in the shaft. Means is provided to shut down the motor and signal upon the opening of the contacts in the switch.
    Type: Grant
    Filed: April 12, 1976
    Date of Patent: November 8, 1977
    Inventor: Marvin L. Colmer