Patents by Inventor Cynthia Lee Trent

Cynthia Lee Trent 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).

  • Solventless purgeable diaphragm valved manifold for low vapor pressure chemicals
    Patent number: 6431229
    Abstract: A manifold for transfer of chemical, comprising; a heated first conduit for connecting a vessel for containing the chemical to a another vessel, a source of pressurized gas and a source of vacuum; a heated first block valve assembly having first and second diaphragm valves, each valve having a diaphragm and a valve seat side and a diaphragm side, wherein the valve seat side of each valve is juxtaposed to the valve seat side of the other valve, and each valve seat side of each valve communicating with the first conduit; a first connector in the first conduit for detaching the conduit from the vessel; a second conduit, for delivering chemical to the vessel, the second conduit connected to the diaphragm side of the first valve; and a third conduit, for communicating pressurized gas and vacuum to the first conduit, connected to the diaphragm side of the second valve.
    Type: Grant
    Filed: August 24, 2001
    Date of Patent: August 13, 2002
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Charles Michael Birtcher, Robert Sam Zorich, Thomas Andrew Steidl, Gil Vivanco, Cynthia Lee Trent, David James Silva