Patents by Inventor James W. Appelgren

James W. Appelgren 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).

  • Digital position control
    Patent number: 3949286
    Abstract: A digital position control for linearly moving apparatus driven by a motor includes a command signal generating loop coupled to a motor operative condition control loop. The command signal generating loop provides a digital pulse train signal having frequency characteristics corresponding to the desired accelerations and velocities of the apparatus and a total number of pulses proportional to the desired movement of the apparatus. The motor operative condition control loop employs the command signal to energize the motor in accordance with the frequency and pulse count characteristics of the command signal.
    Type: Grant
    Filed: November 5, 1974
    Date of Patent: April 6, 1976
    Assignee: Dynapar Corporation
    Inventor: James W. Appelgren