Patents by Inventor Randolph J. Christman

Randolph J. Christman 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).

  • Air admittance vent
    Patent number: 8360105
    Abstract: The air admittance vent (“AAV”) includes a cup shaped vent body and a vertically reciprocating valve element that seats against a valve seat that has two separate contact areas defined by an annular ridge and a conical face formed in the bottom of the vent body. When the valve element moves into its closed position, the pliable diaphragm of the valve element initially contacts the annular ridge, which forms a first part of the valve seat before moving fully into sealing contact with the conical face, which forms the second part of the valve seat. The contact with the annular ridge provides a first initial seal before the diaphragm nests into contact with the conical face to form a second seal with the valve seat.
    Type: Grant
    Filed: April 18, 2011
    Date of Patent: January 29, 2013
    Assignee: JB Products, Inc.
    Inventors: Steven W. Cashen, Randolph J. Christman, Patrick D. Delahanty, Maynard R. Searing, Sr., G. Scott Searing, Fred Krolzick
  • Air admittance vent
    Publication number: 20120261006
    Abstract: The air admittance vent (“AAV”) includes a cup shaped vent body and a vertically reciprocating valve element that seats against a valve seat that has two separate contact areas defined by an annular ridge and a conical face formed in the bottom of the vent body. When the valve element moves into its closed position, the pliable diaphragm of the valve element initially contacts the annular ridge, which forms a first part of the valve seat before moving fully into sealing contact with the conical face, which forms the second part of the valve seat. The contact with the annular ridge provides a first initial seal before the diaphragm nests into contact with the conical face to form a second seal with the valve seat.
    Type: Application
    Filed: April 18, 2011
    Publication date: October 18, 2012
    Inventors: Steven W. Cashen, Randolph J. Christman, Patrick D. Delahanty, Maynard R. Searing, SR., G. Scott Searing, Fred Krolzick