Patents by Inventor Pascaline H. Nguyen

Pascaline H. Nguyen 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).

  • Patent number: 6239064
    Abstract: Methods and chemical compositions for treating a gas stream comprising non-halogenated and halogenated organic compounds while suppressing halogenation of the non-halogenated organic compounds with the oxidation products of the halogenated organic compounds in the gas stream are disclosed. The gas stream in the presence of oxygen is contacted with the catalyst compositions of the invention to oxidize the non-halogenated and the halogenated compounds to form water, carbon dioxide, and halogen molecules (Cl2, Br2, etc.) and/or halogen acids such as HCl, HBr, etc. An advantage of the present compositions and methods is that halogenation or of the treated emissions is suppressed over a process operating temperature range 400 to 550° C.
    Type: Grant
    Filed: November 18, 1998
    Date of Patent: May 29, 2001
    Assignee: Engelhard Corporation
    Inventors: Pascaline H. Nguyen, James M. Chen, Chung-Zong Wan, Shau-Lin F. Chen, Zhicheng Hu
  • Patent number: 6193504
    Abstract: A rotary regenerative catalytic oxidizer is disclosed which is a portable, compact system that catalytically destroys VOC and odorous compounds at elevated temperatures of 400 to 800° F. Equipped with a very high thermally efficient rotor of 90+%, most heat for reaction is retained in the apparatus, and the cleaned air at temperatures of 80 to 120 F. is safely discharged into room without causing discomfort. As a portable unit, it can be conveniently used to treat local areas where odorous and/or hazardous VOC and CO compounds are present and conveniently run off household 120V or 220V systems.
    Type: Grant
    Filed: March 30, 1998
    Date of Patent: February 27, 2001
    Assignee: Engelhard Corporation
    Inventors: James M. Chen, James C. Fu, Pascaline H. Nguyen, John J. Steger
  • Patent number: 6042795
    Abstract: Methods and apparatus for the catalytic oxidation treatment of waste gas streams that contain entrained solids and gaseous air pollutants such as volatile organic compounds and carbon monoxide, and particularly methods and apparatus suitable for treating waste gas streams from wood burning processes. The method includes a step of washing the gas stream with water prior to the 5catalytic oxidation treatment.
    Type: Grant
    Filed: September 15, 1995
    Date of Patent: March 28, 2000
    Assignee: Engelhard Corporation
    Inventors: James M. Chen, Pascaline H. Nguyen, Ralph E. Truitt
  • Patent number: 5967771
    Abstract: A system for the abatement of industrial process gases utilizes a rotary regenerative oxidizer comprised of one or more heat exchange beds, each bed comprised of a parallel, axial, and longitudinal array of heat regenerative channels that thermally and/or catalytically oxidize contaminated gases. Utilizing a rotary regenerative oxidizer, and if desired, a plurality of heat regenerative beds incorporated therein, facilitates the use of regenerative technology at lower gas flow rates, increases thermal efficiency, and significantly reduces the floor space normally required when implementing fixed-bed nonrotary regenerative oxidizers. The heat exchange channels may be catalytically treated to enhance oxidation of the pollutants at a lower temperature.
    Type: Grant
    Filed: July 17, 1998
    Date of Patent: October 19, 1999
    Assignee: Engelhard Corporation
    Inventors: James M. Chen, Pascaline H. Nguyen, James C. Fu
  • Patent number: 5919425
    Abstract: Homogeneous catalytic regenerative heat transfer packing material is made by impregnating ceramic packing material with a solution of a catalyst precursor and then fixing the precursor into catalyst form. The catalyzed packing material is suitable for use in a process for the regenerative catalytic oxidation of waste gases, in particular, gases that include volatile organic compounds, carbon monoxide or combinations thereof.
    Type: Grant
    Filed: September 21, 1995
    Date of Patent: July 6, 1999
    Assignee: Engelhard Corporation
    Inventors: Pascaline H. Nguyen, James M. Chen, Bulent O. Yavuz, Howard J. Furbeck
  • Patent number: 5895636
    Abstract: Methods and chemical compositions for treating a gas stream comprising non-halogenated and halogenated organic compounds while suppressing halogenation of the non-halogenated organic compounds with the oxidation products of the halogenated organic compounds in the gas stream are disclosed. The gas stream in the presence of oxygen is contacted with the catalyst compositions of the invention to oxidize the non-halogenated and the halogenated compounds to form water, carbon dioxide, and halogen molecules (Cl.sub.2, Br.sub.2, etc.) and/or halogen acids such as HCl, HBr, etc. An advantage of the present compositions and methods is that halogenation or of the treated emissions is suppressed over a process operating temperature range 400 to 550.degree. C.
    Type: Grant
    Filed: December 2, 1997
    Date of Patent: April 20, 1999
    Assignee: Engelhard Corporation
    Inventors: Pascaline H. Nguyen, James M. Chen, Chung-Zong Wan, Shau-Lin Frank Chen, Zhicheng Hu
  • Patent number: 5871347
    Abstract: A system for the abatement of industrial process gases utilizes a rotary regenerative oxidizer comprised of one or more heat exchange beds, each bed comprised of a parallel, axial, and longitudinal array of heat regenerative channels that thermally and/or catalytically oxidize contaminated gases. Utilizing a rotary regenerative oxidizer, and if desired, a plurality of heat regenerative beds incorporated therein, facilitates the use of regenerative technology at lower gas flow rates, increases thermal efficiency, and significantly reduces the floor space normally required when implementing fixed-bed nonrotary regenerative oxidizers. The heat exchange channels may be catalytically treated to enhance oxidation of the pollutants at a lower temperature.
    Type: Grant
    Filed: April 1, 1997
    Date of Patent: February 16, 1999
    Assignee: Engelhard Corporation
    Inventors: James M. Chen, Pascaline H. Nguyen, James C. Fu
  • Patent number: 5653949
    Abstract: A catalyst and process for treating gas streams which contain halogenated organic compounds, non-halogenated organic compounds, carbon monoxide or mixtures thereof, and particularly gas streams which contain organobromides. The catalyst comprises at least one platinum group metal, zirconium oxide and at least one oxide of manganese, cerium or cobalt.
    Type: Grant
    Filed: June 28, 1996
    Date of Patent: August 5, 1997
    Assignee: Engelhard Corporation
    Inventors: James M. Chen, Pascaline H. Nguyen
  • Patent number: 5578283
    Abstract: A catalyst and process for treating gas streams which contain halogenated organic compounds, non-halogenated organic compounds, carbon monoxide or mixtures thereof, and particularly gas streams which contain organobromides. The catalyst comprises at least one platinum group metal, zirconium oxide and at least one oxide of manganese, cerium or cobalt.
    Type: Grant
    Filed: December 30, 1994
    Date of Patent: November 26, 1996
    Assignee: Engelhard Corporation
    Inventors: James M. Chen, Pascaline H. Nguyen
  • Patent number: 5283041
    Abstract: A catalyst is disclosed for treating gas streams containing organic compounds such as halogenated organic compounds. The catalyst is comprised of vanadium oxide, zirconium oxide and at least one oxide of manganese, cerium or cobalt.Also disclosed is a process for treating gas streams using such catalysts.
    Type: Grant
    Filed: August 13, 1992
    Date of Patent: February 1, 1994
    Assignee: Engelhard Corporation
    Inventors: Pascaline H. Nguyen, Eric W. Stern, Michel Deeba, Patrick L. Burk
  • Patent number: 4811162
    Abstract: A composition for use in terminating a capacitor composed of a ceramic body containing embedded metal electrodes is disclosed. The end termination composition comprises a metallo organic silver material. A method for terminating a capacitor employing the metallo organic silver based composition is also disclosed.
    Type: Grant
    Filed: April 27, 1987
    Date of Patent: March 7, 1989
    Assignee: Engelhard Corporation
    Inventors: John P. Maher, Pascaline H. Nguyen
  • Patent number: 4808274
    Abstract: The present invention is directed to metallized substrates and particularly metallized substrates for use in microwave integrated circuits and a process for producing such substrates. The metallized substrates generally comprise a dielectric substrate on which is formed a pattern such as a conductor line pattern, the pattern being formed of a conductive metal. The metallization is accomplished by forming one or more adhesion layers from a metallo organic composition which is built up with a metal conductor.
    Type: Grant
    Filed: September 10, 1986
    Date of Patent: February 28, 1989
    Assignee: Engelhard Corporation
    Inventor: Pascaline H. Nguyen