Patents by Inventor Patrick E. DeNardo

Patrick E. DeNardo 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).

  • Frostproof hydrant seal
    Patent number: 5740831
    Abstract: A sillcock which has freeze resistance, backflow contamination resistance and back pressure release from the downstream water, having a resilient, radially compressible and expandable back pressure seal valve which is also axially movable a controlled amount to thereby cover or uncover an inner vent hole between the water passage and a vent passage, to allow pressure release from the water flow passage to the atmosphere.
    Type: Grant
    Filed: December 31, 1996
    Date of Patent: April 21, 1998
    Assignee: Nibco Inc.
    Inventors: Patrick E. DeNardo, Mark A. Clark