Patents by Inventor William Lloyd Hewitt

William Lloyd Hewitt 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).

  • Intermittent pilot igniter and valve controller for gas burner
    Patent number: 3986813
    Abstract: A system for controlling the pilot and main burner gas valves of a gas furnace or the like, including a pilot spark igniter and a pilot flame sensor. A relay having a first standby mode providing power to the spark igniter circuit when the thermostat switch is closed and the pilot valve solenoid is energized, and a second operating mode disconnecting power from the spark igniter circuit and providing power to the main valve solenoid when a flame is sensed at the pilot burner. A fast responding, stable and failsafe circuit for operating the relay utilizing a 24 volt supply, with a 48 volt supply provided only for the flame sensor.
    Type: Grant
    Filed: June 26, 1975
    Date of Patent: October 19, 1976
    Assignee: Cam-Stat Incorporated
    Inventor: William Lloyd Hewitt
  • Integrated dosage cup and child resistant cap
    Patent number: D781705
    Type: Grant
    Filed: August 22, 2015
    Date of Patent: March 21, 2017
    Assignee: Dosecap, LLC
    Inventor: William Lloyd Hewitt