Patents by Inventor George Francis Schroeder

George Francis Schroeder 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).

  • Cold start system for motors
    Patent number: 4100466
    Abstract: Motors, particularly gyro motors, are started by initially operating the motors at a frequency lower than their normal operating frequency so as to draw a larger current and develop greater starting torque with the maximum current and torque limited by a current limiting DC power supply. Where at least two motors are provided sequencing of the two motors is accomplished thereby permitting use of essentially the same power supply which is required for normal operation.
    Type: Grant
    Filed: December 10, 1976
    Date of Patent: July 11, 1978
    Assignee: The Singer Company
    Inventor: George Francis Schroeder