Patents by Inventor Joseph H. Z. Wu

Joseph H. Z. Wu 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: 6737036
    Abstract: Composite of at least two metal oxides in the form of Primary Particles and a support having a particle size greater than the Primary Particles used in the formation of a catalyst composition for the treatment of a pollutant containing gas.
    Type: Grant
    Filed: December 3, 2002
    Date of Patent: May 18, 2004
    Assignee: Engelhard Corporation
    Inventors: Joseph C. Dettling, Joseph H-Z. Wu
  • Patent number: 6699448
    Abstract: The present invention relates to sulfur tolerant catalyst composites useful for reducing contaminants in exhaust gas streams, especially gaseous streams containing sulfur oxide contaminants. More specifically, the present invention is concerned with improved NOx trap catalysts for use in diesel engines as well as lean burn gasoline engines. The sulfur tolerant NOx trap catalyst composites comprise a platinum component, a support, and a NOx sorbent component prepared by hydrothermal synthesis. The NOx sorbent component comprises a first metal oxide and a second metal oxide. The metal in the first metal oxide is selected from the group consisting of aluminum, titanium, zirconium, silicon, and composites thereof, and the metal in the second metal oxide is selected from the group consisting of Group IIA metals, Group II metals, Group IV metals, rare earth metals, and transition metals. The metal in the first metal oxide is different from the metal in the second metal oxide.
    Type: Grant
    Filed: January 16, 2002
    Date of Patent: March 2, 2004
    Assignee: Engelhard Corporation
    Inventors: Joseph H-Z. Wu, Joseph C. Dettling
  • Publication number: 20030206845
    Abstract: The present invention relates to sulfur tolerant catalyst composites useful for reducing contaminants in exhaust gas streams, especially gaseous streams containing sulfur oxide contaminants. More specifically, the present invention is concerned with improved NOx trap catalysts for use in diesel engines as well as lean burn gasoline engines. The sulfur tolerant NOx trap catalyst composites comprise a platinum component, a support, and a NOx sorbent component prepared by hydrothermal synthesis. The NOx sorbent component comprises a first metal oxide and a second metal oxide. The metal in the first metal oxide is selected from the group consisting of aluminum, titanium, zirconium, silicon, and composites thereof, and the metal in the second metal oxide is selected from the group consisting of Group IIA metals, Group III metals, Group IV metals, rare earth metals, and transition metals. The metal in the first metal oxide is different from the metal in the second metal oxide.
    Type: Application
    Filed: April 23, 2003
    Publication date: November 6, 2003
    Applicant: Engelhard Corporation
    Inventors: Joseph H-Z. Wu, Joseph C. Dettling
  • Patent number: 6585945
    Abstract: The present invention relates to sulfur tolerant catalyst composites useful for reducing contaminants in exhaust gas streams, especially gaseous streams containing sulfur oxide contaminants. More specifically, the present invention is concerned with improved NOx trap catalysts for use in diesel engines as well as lean burn gasoline engines. The sulfur tolerant NOx trap catalyst composites comprise a platinum component, a support, and a NOx sorbent component prepared by hydrothermal synthesis. The NOx sorbent component comprises a first metal oxide and a second metal oxide. The metal in the first metal oxide is selected from the group consisting of aluminum, titanium, zirconium, silicon, and composites thereof, and the metal in the second metal oxide is selected from the group consisting of Group IIA metals, Group III metals, Group IV metals, rare earth metals, and transition metals. The metal in the first metal oxide is different from the metal in the second metal oxide.
    Type: Grant
    Filed: January 26, 2001
    Date of Patent: July 1, 2003
    Assignee: Engelhard Corporation
    Inventors: Joseph H-Z. Wu, Joseph C. Dettling
  • Publication number: 20030095903
    Abstract: Composite of at least two metal oxides in the form of Primary Particles and a support having a particle size greater than the Primary Particles used in the formation of a catalyst composition for the treatment of a pollutant containing gas.
    Type: Application
    Filed: December 3, 2002
    Publication date: May 22, 2003
    Inventors: Joseph C. Dettling, Joseph H-Z. Wu
  • Patent number: 6528029
    Abstract: Composite of at least two metal oxides in the form of Primary Particles and a support having a particle size greater than the Primary Particles used in the formation of a catalyst composition for the treatment of a pollutant containing gas.
    Type: Grant
    Filed: October 13, 1999
    Date of Patent: March 4, 2003
    Assignee: Engelhard Corporation
    Inventors: Joseph C. Dettling, Joseph H-Z. Wu
  • Publication number: 20020182134
    Abstract: The present invention relates to sulfur tolerant catalyst composites useful for reducing contaminants in exhaust gas streams, especially gaseous streams containing sulfur oxide contaminants. More specifically, the present invention is concerned with improved NOx trap catalysts for use in diesel engines as well as lean burn gasoline engines. The sulfur tolerant NOx trap catalyst composites comprise a platinum component, a support, and a NOx sorbent component prepared by hydrothermal synthesis. The NOx sorbent component comprises a first metal oxide and a second metal oxide. The metal in the first metal oxide is selected from the group consisting of aluminum, titanium, zirconium, silicon, and composites thereof, and the metal in the second metal oxide is selected from the group consisting of Group IIA metals, Group II metals, Group IV metals, rare earth metals, and transition metals. The metal in the first metal oxide is different from the metal in the second metal oxide.
    Type: Application
    Filed: January 16, 2002
    Publication date: December 5, 2002
    Applicant: ENGELHARD CORPORATION
    Inventors: Joseph H-Z. Wu, Joseph C. Dettling
  • Publication number: 20020141921
    Abstract: The present invention relates to sulfur tolerant catalyst composites useful for reducing contaminants in exhaust gas streams, especially gaseous streams containing sulfur oxide contaminants. More specifically, the present invention is concerned with improved NOx trap catalysts for use in diesel engines as well as lean burn gasoline engines. The sulfur tolerant NOx trap catalyst composites comprise a platinum component, a support, and a NOx sorbent component prepared by hydrothermal synthesis. The NOx sorbent component comprises a first metal oxide and a second metal oxide. The metal in the first metal oxide is selected from the group consisting of aluminum, titanium, zirconium, silicon, and composites thereof, and the metal in the second metal oxide is selected from the group consisting of Group IIA metals, Group III metals, Group IV metals, rare earth metals, and transition metals. The metal in the first metal oxide is different from the metal in the second metal oxide.
    Type: Application
    Filed: January 26, 2001
    Publication date: October 3, 2002
    Inventors: Joseph H-Z. Wu, Joseph C. Dettling
  • Patent number: 6248688
    Abstract: The present invention relates to a zirconium, rare earth containing composition comprising zirconium, cerium, neodymium and praseodymium components and the use of this composition in a catalyst composition useful for the treatment of gases to reduce contaminants contained therein and method process to make the catalyst composition. The catalyst has the capability of substantially simultaneously catalyzing the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides.
    Type: Grant
    Filed: January 28, 1999
    Date of Patent: June 19, 2001
    Assignee: Engelhard Corporation
    Inventors: Joseph H. Z. Wu, Mukaram K. Syed
  • Patent number: 5997626
    Abstract: A method for reducing the abrasion of a silica-containing calcined kaolin pigment by the controlled leaching of silica from the pigment, preferably by the use of a caustic solution to dissolve the silica out of the calcined kaolin. In another aspect of the invention, the brightness, opacity, or both of a calcined kaolin is increased by increasing the fineness of the kaolin feed supplied to the calciner. The combination of these methods results in the production of a calcined kaolin with low abrasion and high brightness and opacity. Another aspect of the invention concerns an improved method of filtration of dilatent materials such as the leached calcined clay.
    Type: Grant
    Filed: May 1, 1998
    Date of Patent: December 7, 1999
    Assignee: Engelhard Corporation
    Inventors: Joseph H. Z. Wu, Michael G. Londo, Mitchell J. Willis, Rene S. Guermonprez, Tracey A. Burbank
  • Patent number: 5898014
    Abstract: The present invention relates to a zirconium, rare earth containing composition comprising zirconium, cerium, neodymium and praseodymium components and the use of this composition in a catalyst composition useful for the treatment of gases to reduce contaminants contained therein and method process to make the catalyst composition. The catalyst has the capability of substantially simultaneously catalyzing the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides.
    Type: Grant
    Filed: September 27, 1996
    Date of Patent: April 27, 1999
    Assignee: Engelhard Corporation
    Inventors: Joseph H. Z. Wu, Shiang Sung, Zhicheng Hu, John J. Steger
  • Patent number: 5326381
    Abstract: A trace amount of a polytetrafluoroethylene resin is incorporated with an abrasive pigment prior to or during the preparation of an aqueous pigment slurry or is applied to dry pigment to reduce the abrasivity of the pigment. The treated pigment can be employed in the manufacture of filled and coated paper.
    Type: Grant
    Filed: May 10, 1993
    Date of Patent: July 5, 1994
    Assignee: Engelhard Corporation
    Inventor: Joseph H. Z. Wu
  • Patent number: 5282898
    Abstract: The present invention provides a simple inexpensive means to decrease the abrasivity of abrasive pigments such as calcined kaolin and titania. In accordance with this invention, a trace of a nonionic and/or anionic surfactant is incorporated with abrasion pigment prior to or during the preparation of an aqueous pigment slurry or to dry pigment.
    Type: Grant
    Filed: June 12, 1992
    Date of Patent: February 1, 1994
    Assignee: Engelhard Corporation
    Inventor: Joseph H. Z. Wu
  • Patent number: 5232881
    Abstract: The present invention provides a simple inexpensive means to decrease the abrasivity of abrasive pigments such as calcined kaolin and titania. In accordance with this invention, a trace of a nonionic surfactant of the general formula ##STR1## is incorporated with abrasive pigment prior to or during the preparation of an aqueous pigment slurry or to dry pigment.
    Type: Grant
    Filed: November 3, 1992
    Date of Patent: August 3, 1993
    Assignee: Engelhard Corporation
    Inventor: Joseph H. Z. Wu