Patents by Inventor Madhu Ramavajjala

Madhu Ramavajjala 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 for reducing NOx from exhaust gases produced by industrial processes
    Patent number: 6348178
    Abstract: Gas-phase methods and systems for reducing NOx emissions and other contaminants in exhaust gases, and industrial processes using the same, are disclosed. In accordance with the present invention, hydrocarbon(s) autoignite and autothermally heat an exhaust gas from an industrial process so that NH3, HNCO or a combination thereof are effective for selectively reducing NOx autocatalytically. Preferably, the reduction of NOx is initiated/driven by the autoignition of hydrocarbon(s) in the exhaust gas. Within the temperature range of about 900-1600° F., the introduced hydrocarbon(s) autoignite spontaneously under fuel-lean conditions of about 2-18% O2 in the exhaust gas. Once ignited, the reactions proceed autocatalytically, beating the exhaust gas autothermally. Under some conditions, a blue chemiluminescence may be visible.
    Type: Grant
    Filed: May 3, 1999
    Date of Patent: February 19, 2002
    Assignee: Noxtech, Inc.
    Inventors: Bruce C. Sudduth, Ralph J. Slone, Vishwesh Palekar, Madhu Ramavajjala
  • Apparatus and method for reducing NOx from exhaust gases produced by industrial processes
    Patent number: 6066303
    Abstract: Gas-phase methods and systems for reducing NOx emissions and other contaminants in exhaust gases, and industrial processes using the same, are disclosed. In accordance with the present invention, hydrocarbon(s) autoignite and autothermally heat an exhaust gas from an industrial process so that NH.sub.3, HNCO or a combination thereof are effective for selectively reducing NOx autocatalytically. Preferably, the reduction of NOx is initiated/driven by the autoignition of hydrocarbon(s) in the exhaust gas. Within the temperature range of about 900-1600.degree. F., the introduced hydrocarbon(s) autoignite spontaneously under fuel-lean conditions of about 2-18% O.sub.2 in the exhaust gas. Once ignited, the reactions proceed autocatalytically, heating the exhaust gas autothermally. Under some conditions, a blue chemiluminescence may be visible.
    Type: Grant
    Filed: December 14, 1998
    Date of Patent: May 23, 2000
    Assignee: Noxtech, Inc.
    Inventors: Bruce C. Sudduth, Ralph J. Slone, Vishwesh Palekar, Madhu Ramavajjala
  • Apparatus and method for reducing NOx from exhaust gases produced by industrial processes
    Patent number: 5985222
    Abstract: Gas-phase methods and systems for reducing NOx emissions and other contaminants in exhaust gases, and industrial processes using the same, are disclosed. In accordance with the present invention, hydrocarbon(s) autoignite and autothermally heat an exhaust gas from an industrial process so that NH.sub.3, HNCO or a combination thereof are effective for selectively reducing NOx autocatalytically. Preferably, the reduction of NOx is initiated/driven by the autoignition of hydrocarbon(s) in the exhaust gas. Within the temperature range of about 900-1600.degree. F., the introduced hydrocarbon(s) autoignite spontaneously under fuel-lean conditions of about 2-18% O.sub.2 in the exhaust gas. Once ignited, the reactions proceed autocatalytically, heating the exhaust gas autothermally.
    Type: Grant
    Filed: November 1, 1996
    Date of Patent: November 16, 1999
    Assignee: NoxTech, Inc.
    Inventors: Bruce C. Sudduth, Ralph J. Slone, Vishwesh Palekar, Madhu Ramavajjala