Patents by Inventor Michael J. DeLeonardis

Michael J. DeLeonardis 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).

  • 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