Patents by Inventor Kam To Wan

Kam To Wan 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).

  • Publication number: 20130023406
    Abstract: Generally, the present invention relates to improvements in metal utilization in supported, metal-containing catalysts. For example, the present invention relates to methods for directing and/or controlling metal deposition onto surfaces of porous substrates. The present invention also relates to methods for preparing catalysts in which a first metal is deposited onto a support (e.g., a porous carbon support) to provide one or more regions of a first metal at the surface of the support, and a second metal is deposited at the surface of the one or more regions of the first metal. Generally, the electropositivity of the first metal (e.g., copper or iron) is greater than the electropositivity of the second metal (e.g., a noble metal such as platinum) and the second metal is deposited at the surface of the one or more regions of the first metal by displacement of the first metal. The present invention further relates to treated substrates, catalyst precursor structures and catalysts prepared by these methods.
    Type: Application
    Filed: July 25, 2012
    Publication date: January 24, 2013
    Applicant: MONSANTO TECHNOLOGY LLC
    Inventor: Kam-To Wan
  • Patent number: 8252953
    Abstract: Generally, the present invention relates to improvements in metal utilization in supported, metal-containing catalysts. For example, the present invention relates to methods for directing and/or controlling metal deposition onto surfaces of porous substrates. The present invention also relates to methods for preparing catalysts in which a first metal is deposited onto a support (e.g., a porous carbon support) to provide one or more regions of a first metal at the surface of the support, and a second metal is deposited at the surface of the one or more regions of the first metal. Generally, the electropositivity of the first metal (e.g., copper or iron) is greater than the electropositivity of the second metal (e.g., a noble metal such as platinum) and the second metal is deposited at the surface of the one or more regions of the first metal by displacement of the first metal. The present invention further relates to treated substrates, catalyst precursor structures and catalysts prepared by these methods.
    Type: Grant
    Filed: May 1, 2009
    Date of Patent: August 28, 2012
    Assignee: Monsanto Technology LLC
    Inventor: Kam-To Wan
  • Patent number: 8143441
    Abstract: This invention relates to an improved catalyst, comprising a carbon support having a noble metal at its surface, for use in catalyzing liquid phase oxidation reactions, especially in an acidic oxidative environment and in the presence of solvents, reactants, intermediates, or products which solubilize noble metals; a process for the preparation of the improved catalyst; a liquid phase oxidation process using such a catalyst wherein the catalyst exhibits improved resistance to noble metal leaching, particularly in acidic oxidative environments and in the presence of solvents, reactants, intermediates, or products which solubilize noble metals; and a liquid phase oxidation process in which N-(phosphonomethyl)iminodiacetic acid (i.e., “PMIDA”) or a salt thereof is oxidized to form N-(phosphonomethyl)glycine (i.e., “glyphosate”) or a salt thereof using such a catalyst wherein the oxidation of the formaldehyde and formic acid by-products into carbon dioxide and water is increased.
    Type: Grant
    Filed: June 5, 2006
    Date of Patent: March 27, 2012
    Assignee: Monsanto Technology LLC
    Inventors: Jerry R. Ebner, Mark A. Leiber, Kam-To Wan, Anthony Woods, Peter E. Rogers
  • Publication number: 20100130774
    Abstract: This invention relates to the field of heterogeneous catalysis, and more particularly to oxidation catalysts including carbon supports having deposited thereon a noble metal and one or more optional promoters and to methods for their preparation. The invention further relates to the field of heterogeneous catalytic oxidation reactions, including the preparation of secondary amines by the catalytic oxidation of tertiary amines, such as the oxidation of an N-(phosphonomethyl)iminodiacetic acid to produce an N-(phosphonomethyl)glycine product.
    Type: Application
    Filed: September 15, 2005
    Publication date: May 27, 2010
    Applicant: MONSANTO TECHNOLOGY LLC
    Inventors: Kam-To Wan, Mark A. Leiber, Kerry Brethauer, Jingyue Liu
  • Publication number: 20090326262
    Abstract: Generally, the present invention relates to improvements in metal utilization in supported, metal-containing catalysts. For example, the present invention relates to methods for directing and/or controlling metal deposition onto surfaces of porous substrates. The present invention also relates to methods for preparing catalysts in which a first metal is deposited onto a support (e.g., a porous carbon support) to provide one or more regions of a first metal at the surface of the support, and a second metal is deposited at the surface of the one or more regions of the first metal. Generally, the electropositivity of the first metal (e.g., copper or iron) is greater than the electropositivity of the second metal (e.g., a noble metal such as platinum) and the second metal is deposited at the surface of the one or more regions of the first metal by displacement of the first metal. The present invention further relates to treated substrates, catalyst precursor structures and catalysts prepared by these methods.
    Type: Application
    Filed: May 1, 2009
    Publication date: December 31, 2009
    Applicant: MONSANTO TECHNOLOGY LLC
    Inventor: Kam-To Wan
  • Patent number: 7291751
    Abstract: This invention relates to the use of a supplemental promoter in conjunction with a noble-metal-containing catalyst comprising a carbon support in catalyzing liquid phase oxidation reactions, a process for making of an improved catalyst comprising such a supplemental promoter, and an improved catalyst comprising such a supplemental promoter. In a particularly preferred embodiment, a supplemental promoter (most preferably bismuth or tellurium) is used in conjunction with a noble-metal-containing catalyst comprising a carbon support in a liquid phase oxidation process wherein N-(phosphonomethyl)iminodiacetic acid (i.e., “PMIDA”) or a salt thereof is oxidized to form N-(phosphonomethyl)glycine (i.e., “glyphosate”) or a salt thereof. The benefits of such a process include increased oxidation of the formaldehyde and formic acid by-products, and, consequently, decreased final concentrations of those by-products as well as other undesirable by-products, most notably N-methyl-N-(phosphonomethyl)glycine (i.e.
    Type: Grant
    Filed: January 10, 2007
    Date of Patent: November 6, 2007
    Assignee: Monsanto Technology LLC
    Inventors: Mark A. Leiber, Kam-To Wan
  • Publication number: 20070129567
    Abstract: This invention relates to the use of a supplemental promoter in conjunction with a noble-metal-containing catalyst comprising a carbon support in catalyzing liquid phase oxidation reactions, a process for making of an improved catalyst comprising such a supplemental promoter, and an improved catalyst comprising such a supplemental promoter. In a particularly preferred embodiment, a supplemental promoter (most preferably bismuth or tellurium) is used in conjunction with a noble-metal-containing catalyst comprising a carbon support in a liquid phase oxidation process wherein N-(phosphonomethyl)iminodiacetic acid (i.e., “PMIDA”) or a salt thereof is oxidized to form N-(phosphonomethyl)glycine (i.e., “glyphosate”) or a salt thereof. The benefits of such a process include increased oxidation of the formaldehyde and formic acid by-products, and, consequently, decreased final concentrations of those by-products as well as other undesirable by-products, most notably N-methyl-N-(phosphonomethyl)glycine (i.e., “NMG”).
    Type: Application
    Filed: January 10, 2007
    Publication date: June 7, 2007
    Applicant: MONSANTO TECHNOLOGY LLC
    Inventors: Mark Leiber, Jerry Ebner, Kam-To Wan, Anthony Woods, Peter Rogers
  • Publication number: 20070100161
    Abstract: This invention relates to an improved catalyst, comprising a carbon support having a noble metal at its surface, for use in catalyzing liquid phase oxidation reactions, especially in an acidic oxidative environment and in the presence of solvents, reactants, intermediates, or products which solubilize noble metals; a process for the preparation of the improved catalyst; a liquid phase oxidation process using such a catalyst wherein the catalyst exhibits improved resistance to noble metal leaching, particularly in acidic oxidative environments and in the presence of solvents, reactants, intermediates, or products which solubilize noble metals; and a liquid phase oxidation process in which N-(phosphonomethyl)iminodiacetic acid (i.e., “PMIDA”) or a salt thereof is oxidized to form N-(phosphonomethyl)glycine (i.e., “glyphosate”) or a salt thereof using such a catalyst wherein the oxidation of the formaldehyde and formic acid by-products into carbon dioxide and water is increased.
    Type: Application
    Filed: June 5, 2006
    Publication date: May 3, 2007
    Applicant: Monsanto Technology LLC
    Inventors: Jerry Ebner, Mark Leiber, Kam-To Wan, Peter Rogers, Jingye Liu, William Scholle, Anthony Woods
  • Patent number: 7067693
    Abstract: This invention relates to an improved catalyst, comprising a carbon support having a noble metal at its surface, for use in catalyzing liquid phase oxidation reactions, especially in an acidic oxidative environment and in the presence of solvents, reactants, intermediates, or products which solubilize noble metals; a process for the preparation of the improved catalyst; a liquid phase oxidation process using such a catalyst wherein the catalyst exhibits improved resistance to noble metal leaching, particularly in acidic oxidative environments and in the presence of solvents, reactants, intermediates, or products which solubilize noble metals; and a liquid phase oxidation process in which N-(phosphonomethyl)iminodiacetic acid (i.e., “PMIDA”) or a salt thereof is oxidized to form N-(phosphonomethyl) glycine (i.e., “glyphosate”) or a salt thereof using such a catalyst wherein the oxidation of the formaldehyde and formic acid by-products into carbon dioxide and water is increased.
    Type: Grant
    Filed: September 29, 1999
    Date of Patent: June 27, 2006
    Assignee: Monsanto Technology LLC
    Inventors: Jerry R. Ebner, Mark A. Leiber, Kam-To Wan, Anthony Woods, Peter E. Rogers, Jingye Liu, William A. Scholle
  • Patent number: 6963009
    Abstract: This invention relates to the use of a supplemental promoter in conjunction with a noble-metal-containing catalyst comprising a carbon support in catalyzing liquid phase oxidation reactions. In a particularly preferred embodiment, a supplemental promoter (most preferably bismuth or tellurium) is used in conjunction with a noble-metal-containing catalyst comprising a carbon support in a liquid phase oxidation process wherein N-(phosphonomethyl) iminodiacetic acid (i.e., “PMIDA”) or a salt thereof is oxidized to form N-(phosphonomethyl)glycine (i.e., “glyphosate”) or a salt thereof. The benefits of such a process include oxidation of the formaldehyde and formic acid by-products, and, consequently, decreased final concentrations of those by-products as well as other undesirable by-products, most notably N-methyl-N-(phosphonomethyl)glycine (i.e., “NMG”).
    Type: Grant
    Filed: May 1, 2003
    Date of Patent: November 8, 2005
    Assignee: Monsanto Technology LLC
    Inventors: Mark A. Leiber, Jerry R. Ebner, Kam-To Wan, Anthony Woods, Peter Rogers
  • Patent number: 6890786
    Abstract: This invention relates to a method of fabricating a light modulation system having a semiconductor substrate. In one exemplary method, an optical layer is applied over a semiconductor substrate which includes a plurality of integrated circuits. Each of these integrated circuits is capable of creating a separate display device. A protective layer is then applied over the optical layer. The plurality of integrated circuits is then singulated. Various other embodiments of apparatuses and methods are disclosed.
    Type: Grant
    Filed: April 22, 2002
    Date of Patent: May 10, 2005
    Assignee: Brillian Corporation
    Inventors: Tobias W. Walker, Douglas J. McKnight, Kam Wan
  • Publication number: 20030229246
    Abstract: This invention relates to the use of a supplemental promoter in conjunction with a noble-metal-containing catalyst comprising a carbon support in catalyzing liquid phase oxidation reactions, a process for making of an improved catalyst comprising such a supplemental promoter, and an improved catalyst comprising such a supplemental promoter.
    Type: Application
    Filed: May 1, 2003
    Publication date: December 11, 2003
    Applicant: Monsanto Technology LLC
    Inventors: Mark A. Leiber, Jerry R. Ebner, Kam-To Wan, Anthony Woods, Peter Rogers
  • Patent number: 6603039
    Abstract: This invention relates to an improved catalyst, comprising a carbon support having a noble metal at its surface, for use in catalyzing liquid phase oxidation reactions, especially in an acidic oxidative environment and in the presence of solvents, reactants, intermediates, or products which solubilize noble metals; a process for the preparation of the improved catalyst; a liquid phase oxidation process using such a catalyst wherein the catalyst exhibits improved resistance to noble metal leaching, particularly in acidic oxidative environments and in the presence of solvents, reactants, intermediates, or products which solubilize noble metals; and a liquid phase oxidation process in which N-(phosphonomethyl)iminodiacetic acid (i.e., “PMIDA”) or a salt thereof is oxidized to form N-(phosphonomethyl)glycine (i.e., “glyphosate”) or a salt thereof using such a catalyst wherein the oxidation of the formaldehyde and formic acid by-products into carbon dioxide and water is increased.
    Type: Grant
    Filed: September 29, 1999
    Date of Patent: August 5, 2003
    Assignee: Monsanto Technology LLC
    Inventors: Jerry R. Ebner, Mark A. Leiber, Kam-To Wan, Peter E. Rogers, Jingyue Liu, Anthony Woods
  • Patent number: 6586621
    Abstract: This invention relates to the use of a supplemental promoter in conjunction with a noble-metal-containing catalyst comprising a carbon support in catalyzing liquid phase oxidation reactions, a process for making of an improved catalyst comprising such a supplemental promoter, and an improved catalyst comprising such a supplemental promoter. In a particularly preferred embodiment, a supplemental promoter (most preferably bismuth or tellurium) is used in conjunction with a noble-metal-containing catalyst comprising a carbon support in a liquid phase oxidation process wherein N-(phosphonomethyl) iminodiacetic acid (i.e., “PMIDA”) or a salt thereof is oxidized to form N-(phosphonomethyl) glycine (i.e., “glyphosate”) or a salt thereof.
    Type: Grant
    Filed: December 21, 2000
    Date of Patent: July 1, 2003
    Assignee: Monsanto Technology LLC
    Inventors: Mark A. Leiber, Jerry R. Ebner, Kam-To Wan, Anthony Woods, Peter Rogers
  • Publication number: 20020187593
    Abstract: This invention relates to a method of fabricating a light modulation system having a semiconductor substrate. In one exemplary method, an optical layer is applied over a semiconductor substrate which includes a plurality of integrated circuits. Each of these integrated circuits is capable of creating a separate display device. A protective layer is then applied over the optical layer. The plurality of integrated circuits is then singulated. Various other embodiments of apparatuses and methods are disclosed.
    Type: Application
    Filed: April 22, 2002
    Publication date: December 12, 2002
    Inventors: Tobias W. Walker, Douglas J. McKnight, Kam Wan
  • Patent number: 6476415
    Abstract: This invention relates to a method of fabricating a light modulation system having a semiconductor substrate. In one exemplary method, an optical layer is applied over a semiconductor substrate which includes a plurality of integrated circuits. Each of these integrated circuits is capable of creating a separate display device. A protective layer is then applied over the optical layer. The plurality of integrated circuits is then singulated. Various other embodiments of apparatuses and methods are disclosed.
    Type: Grant
    Filed: July 20, 2000
    Date of Patent: November 5, 2002
    Assignee: Three-Five Systems, Inc.
    Inventors: Tobias W. Walker, Douglas J. McKnight, Kam Wan
  • Patent number: 6417133
    Abstract: This invention relates to an improved catalyst, comprising a carbon support having a noble metal at its surface, for use in catalyzing liquid phase oxidation reactions, especially in an acidic oxidative environment and in the presence of solvents, reactants, intermediates, or products which solubilize noble metals; a process for the preparation of the improved catalyst; a liquid phase oxidation process using such a catalyst wherein the catalyst exhibits improved resistance to noble metal leaching, particularly in acidic oxidative environments and in the presence of solvents, reactants, intermediates, or products which solubilize noble metals; and a liquid phase oxidation process in which N-(phosphonomethyl)iminodiacetic acid (i.e., “PMIDA”) or a salt thereof is oxidized to form N-(phosphonomethyl)glycine (i.e., “glyphosate”) or a salt thereof using such a catalyst wherein the oxidation of the formaldehyde and formic acid by-products into carbon dioxide and water is increased.
    Type: Grant
    Filed: February 11, 1999
    Date of Patent: July 9, 2002
    Assignee: Monsanto Technology LLC
    Inventors: Jerry R. Ebner, Mark A. Leiber, Kam-To Wan, Peter E. Rogers, Jingyue Liu, Anthony Woods
  • Publication number: 20020016503
    Abstract: This invention relates to the use of a supplemental promoter in conjunction with a noble-metal-containing catalyst comprising a carbon support in catalyzing liquid phase oxidation reactions, a process for making of an improved catalyst comprising such a supplemental promoter, and an improved catalyst comprising such a supplemental promoter.
    Type: Application
    Filed: December 21, 2000
    Publication date: February 7, 2002
    Inventors: Mark A. Leiber, Jerry R. Ebner, Kam-To Wan, Anthony Woods, Peter Rogers
  • Patent number: 6337298
    Abstract: This invention relates to an improved catalyst, comprising a carbon support having a noble metal at its surface, for use in catalyzing liquid phase oxidation reactions, especially in an acidic oxidative environment and in the presence of solvents, reactants, intermediates, or products which solubilize noble metals; a process for the preparation of the improved catalyst; a liquid phase oxidation process using such a catalyst wherein the catalyst exhibits improved resistance to noble metal leaching, particularly in acidic oxidative environments and in the presence of solvents, reactants, intermediates, or products which solubilize noble metals; and a liquid phase oxidation process in which N-(phosphonomethyl)iminodiacetic acid (i.e., “PMIDA”) or a salt thereof is oxidized to form N-(phosphonomethyl)glycine (i.e., “glyphosate”) or a salt thereof using such a catalyst wherein the oxidation of the formaldehyde and formic acid by-products into carbon dioxide and water is increased.
    Type: Grant
    Filed: February 11, 1999
    Date of Patent: January 8, 2002
    Assignee: Monsanto Company
    Inventors: Jerry R. Ebner, Mark A. Leiber, Kam-To Wan, Peter E. Rogers, Jingyue Liu, Anthony Woods
  • Publication number: 20010018536
    Abstract: This invention is directed to an improved process for the preparation of N-(phosphonomethyl)glycine (i.e., “glyphosate”), a salt of N-(phosphonomethyl)glycine, or an ester of N-(phosphonomethyl)glycine. The process comprises combining an N-substituted N-(phosphonomethyl)glycine reactant with oxygen in the presence of a noble metal catalyst.
    Type: Application
    Filed: February 5, 2001
    Publication date: August 30, 2001
    Inventors: David A. Morgenstern, David E. McKenzie, Robert Orth, David Oburn, Cindy Ludwig, Kam-To Wan, John M. Dzenitis