Patents by Inventor Dee R. Walker

Dee R. Walker 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).

  • Pump controller
    Patent number: 6534947
    Abstract: A method and apparatus for controlling an electric motor pump. The method includes the acts of providing an AC power signal having a positive half cycle and a negative half cycle, measuring the voltage of the AC power signal and generating a first two-state output signal that is in a logic high state when the measured voltage is on the positive half cycle and that is in a logic low state when the measured voltage is on the negative half cycle, and measuring the current of the AC power signal and generating a second two-state output signal that is in logic high state when the measured current is on the positive half cycle and that is in a logic low state when the measured current is on the negative half cycle.
    Type: Grant
    Filed: January 12, 2001
    Date of Patent: March 18, 2003
    Assignee: Sta-Rite Industries, Inc.
    Inventors: Steven A. Johnson, Kip M. Larson, Dee R. Walker
  • Pump controller
    Publication number: 20020093306
    Abstract: A method and apparatus for controlling an electric motor pump. The method includes the acts of providing an AC power signal having a positive half cycle and a negative half cycle, measuring the voltage of the AC power signal and generating a first two-state output signal that is in a logic high state when the measured voltage is on the positive half cycle and that is in a logic low state when the measured voltage is on the negative half cycle, and measuring the current of the AC power signal and generating a second two-state output signal that is in logic high state when the measured current is on the positive half cycle and that is in a logic low state when the measured current is on the negative half cycle.
    Type: Application
    Filed: January 12, 2001
    Publication date: July 18, 2002
    Inventors: Steven A. Johnson, Kip M. Larson, Dee R. Walker