Patents by Inventor David B. Shield

David B. Shield 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 operating a cooling fluid system
    Patent number: 7614613
    Abstract: In a gravity fed cooling tower liquid return system having a common header with a plurality of valved sub-headers, a distributive control system, risers on the sub-headers, and sensor/transmitters on the risers, some of the sensor/transmitters controlling the valves on their respective sub-headers, sensing the liquid level in each of the sub-headers, comparing the sensed liquid levels in the distributive control system, and controlling the liquid levels in the sub-headers in response to the sensed liquid levels.
    Type: Grant
    Filed: May 4, 2007
    Date of Patent: November 10, 2009
    Assignee: Equistar Chemicals, LP
    Inventor: David B. Shield
  • Method of operating a cooling fluid system
    Publication number: 20080271790
    Abstract: In a gravity fed cooling tower liquid return system having a common header with a plurality of valved sub-headers, a distributive control system, risers on the sub-headers, and sensor/transmitters on the risers, some of the sensor/transmitters controlling the valves on their respective sub-headers, sensing the liquid level in each of the sub-headers, comparing the sensed liquid levels in the distributive control system, and controlling the liquid levels in the sub-headers in response to the sensed liquid levels.
    Type: Application
    Filed: May 4, 2007
    Publication date: November 6, 2008
    Inventor: David B. Shield
  • Method for gold replenishment of electroless gold bath
    Patent number: 5728433
    Abstract: A method for replenishing an electroless gold plating bath in which metallic gold is dissolved into the bath.
    Type: Grant
    Filed: February 28, 1997
    Date of Patent: March 17, 1998
    Assignee: Engelhard Corporation
    Inventors: Tien-Jen Cheng, David B. Shields