Patents Assigned to Hydrolevel Corporation
  • Test circuit
    Patent number: 4007713
    Abstract: A test circuit for use with a boiler control circuit. A test switch and a lamp are connected between ground and a water level electrode. In the presence of a water path, a sufficient potential drop exists between ground and the electrode to light the lamp when the test switch is closed. If a ground or short exists, the lamp will not light.
    Type: Grant
    Filed: August 28, 1975
    Date of Patent: February 15, 1977
    Assignee: Hydrolevel Corporation
    Inventors: Michael J. DeLeonardis, Donado DeLeonardis