Patents by Inventor Allen A. Eggleston

Allen A. Eggleston 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).

  • Method of repairing leaky HVAC service valves and an improved HVAC service valve which prevents leaks
    Patent number: 9383026
    Abstract: In a HVAC service valve comprised of a valve body, the valve body defining a cylindrical cavity for receiving a valve stem, the valve stem being rotatably positioned in the cylindrical cavity of the valve body so as to open and close the service valve when the valve stem is rotated counterclockwise and clockwise respectively, the valve stem having a top portion, the top portion being provided with an O-ring to seal any fluid passageway between the top portion of the valve stem and an inner wall of the cylindrical cavity of the valve body, the valve body further having an upper portion, the upper portion being provided with means for preventing the valve stem from being forced out of the valve body due to refrigerant pressure, the improvement being an elastic seal ring positioned above the top portion of the valve stem and below the means for preventing the valve stem from being forced out of the valve body, the elastic seal ring being sized to fit tightly against the inner wall of the cylindrical cavity.
    Type: Grant
    Filed: July 29, 2014
    Date of Patent: July 5, 2016
    Inventor: Allen A. Eggleston
  • METHOD OF REPAIRING LEAKY HVAC SERVICE VALVES AND AN IMPROVED HVAC SERVICE VALVE WHICH PREVENTS LEAKS
    Publication number: 20150267829
    Abstract: In a HVAC service valve comprised of a valve body, the valve body defining a cylindrical cavity for receiving a valve stem, the valve stem being rotatably positioned in the cylindrical cavity of the valve body so as to open and close the service valve when the valve stem is rotated counterclockwise and clockwise respectively, the valve stem having a top portion, the top portion being provided with an O-ring to seal any fluid passageway between the top portion of the valve stem and an inner wall of the cylindrical cavity of the valve body, the valve body further having an upper portion, the upper portion being provided with means for preventing the valve stern from being forced out of the valve body due to refrigerant pressure, the improvement being an elastic seal ring positioned above the top portion of the valve stem and below the means for preventing the valve stem from being forced out of the valve body, the elastic seal ring being sized to fit tightly against the inner wall of the cylindrical cavity.
    Type: Application
    Filed: July 29, 2014
    Publication date: September 24, 2015
    Inventor: Allen A. Eggleston
  • Fall thru sand trap
    Publication number: 20040168958
    Abstract: The-FALL THRU SAND TRAP employs a screen, open top and bottom to allow sand and debris to fall away from the filter. A transparent holding pipe, sight glass, holding pipe, and a method to back flush.
    Type: Application
    Filed: December 4, 2003
    Publication date: September 2, 2004
    Inventor: Allen A. Eggleston