Patents by Inventor Archie C. Johnson

Archie C. Johnson 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).

  • Patent number: 5198734
    Abstract: A method for stopping the backspinning of a submersible pump motor prior to restarting the motor. A control circuit is provided which rectifies A.C. control voltage and applies the resulting D.C. voltage to an induction motor. This sets up a stationary magnetic field in the stator of the motor which creates a braking effect on the rotor. By braking the backspinning to a stop or to a speed which will not harm the motor if restarted while still backspinning, the motor can be restarted without having to wait until the downward flow of fluid causing the backspinning stops.
    Type: Grant
    Filed: March 9, 1992
    Date of Patent: March 30, 1993
    Assignee: Marathon Oil Company
    Inventor: Archie C. Johnson