Patents by Inventor Garret C. Lau

Garret C. Lau 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: 20230304733
    Abstract: A hydrogen feed stream comprising one or more impurities selected from the group consisting of nitrogen, argon, methane, carbon monoxide, carbon dioxide, oxygen, and water, is purified using a cryogenic temperature swing adsorption (CTSA) process with high overall recovery of hydrogen. The waste gas from regenerating the CTSA may be used to improve the performance of upstream hydrogen processing steps.
    Type: Application
    Filed: February 8, 2022
    Publication date: September 28, 2023
    Applicant: Air Products and Chemicals, Inc.
    Inventors: Shubhra Jyoti Bhadra, Jeffrey R. Hufton, Timothy C. Golden, Aaron Raymond Scott, Kamlesh Ghodasara, Maulik R. Shelat, Garret C. Lau
  • Publication number: 20230249119
    Abstract: A hydrogen feed stream comprising oxygen and one or more impurities selected from the group consisting of nitrogen, argon, methane, carbon monoxide, carbon dioxide, and water, is purified by first removing oxygen using a copper oxide and/or manganese oxide getter, then using a cryogenic temperature swing adsorption (CTSA) process with high overall recovery of hydrogen. The oxygen getter prevents an explosive mixture of hydrogen and oxygen from occurring in the CTSA during regeneration.
    Type: Application
    Filed: February 8, 2022
    Publication date: August 10, 2023
    Applicant: Air Products and Chemicals, Inc.
    Inventors: William J. Casteel, Jr., Garret C. Lau, Timothy C. Golden, Shubhra Jyoti Bhadra, Jeffrey R. Hufton
  • Publication number: 20220357104
    Abstract: A process for recovering at least one fluid (e.g. xenon gas and/or krypton gas, etc.) from a feed gas can include utilization of a compression system, primary heat exchanger unit, a pre-purification unit (PPU), and other units to separate and recover at least one desired fluid. In some embodiments, fluid flows output from a first heat exchanger or separation system of the plant can be split so that a portion of a stream is output for downstream processing to purify xenon (Xe) and/or krypton (Kr) product flow(s) while another portion of the stream is recycled to a compression system or the PPU to undergo further purification and heat exchange so that the product output for downstream processing has a higher concentration of Xe or Kr. Some embodiments can be configured to provide an improved recovery of Xe and/or Kr as well as an improvement in operational efficiency.
    Type: Application
    Filed: May 6, 2021
    Publication date: November 10, 2022
    Applicant: Air Products and Chemicals, Inc.
    Inventors: Declan Patrick O'Connor, Garret C. Lau
  • Patent number: 9321881
    Abstract: A liquid methylenedianiline product is disclosed. The product is produced by reacting aniline and ethylaniline with formaldehyde with an amine to formaldehyde ratio greater than about 2:1. The resulting reaction product is a liquid mixture of methylenedianiline, monoethyl methylenedianiline, and diethyl methylenedianiline having a viscosity of less than about 1000 cps at 40° C.
    Type: Grant
    Filed: August 12, 2011
    Date of Patent: April 26, 2016
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Gauri Sankar Lal, Kristen Elaine Minnich, Pritesh G. Patel, Gamini Ananda Vedage, Garret C. Lau
  • Patent number: 8940263
    Abstract: Hydrogen and carbon monoxide impurities are removed from a dry gas comprising the impurities, wherein the dry gas is at least substantially free of carbon dioxide, by passing the dry gas with sufficient residence time, e.g. at least 1.5 s, through a layer of catalyst comprising a mixture of manganese oxide and copper oxide. The use of expensive noble metal catalysts to remove hydrogen may thereby be avoided. In addition, regeneration of the catalyst using oxygen-containing regeneration gas does not reduce the effectiveness of the catalyst.
    Type: Grant
    Filed: April 10, 2013
    Date of Patent: January 27, 2015
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Timothy Christopher Golden, Jeffrey Raymond Hufton, Mohammad Ali Kalbassi, Garret C. Lau, Christine Waweru, Christopher James Raiswell, Christopher Suggitt, Daniel Patrick Zwilling
  • Publication number: 20140308176
    Abstract: Hydrogen and carbon monoxide impurities are removed from a dry gas comprising the impurities, wherein the dry gas is at least substantially free of carbon dioxide, by passing the dry gas with sufficient residence time, e.g. at least 1.5 s, through a layer of catalyst comprising a mixture of manganese oxide and copper oxide. The use of expensive noble metal catalysts to remove hydrogen may thereby be avoided. In addition, regeneration of the catalyst using oxygen-containing regeneration gas does not reduce the effectiveness of the catalyst.
    Type: Application
    Filed: April 10, 2013
    Publication date: October 16, 2014
    Applicant: Air Products and chemicals, Inc.
    Inventors: Timothy Christopher Golden, Jeffrey Raymond Hufton, Mohammad Ali Kalbassi, Garret C. Lau, Christine Waweru, Christopher James Raiswell, Christopher Suggitt, Daniel Patrick Zwilling
  • Publication number: 20130040060
    Abstract: A liquid methylenedianiline product is disclosed. The product is produced by reacting aniline and ethylaniline with formaldehyde with an amine to formaldehyde ratio greater than about 2:1. The resulting reaction product is a liquid mixture of methylenedianiline, monoethyl methylenedianiline, and diethyl methylenedianiline having a viscosity of less than about 1000 cps at 40° C.
    Type: Application
    Filed: August 12, 2011
    Publication date: February 14, 2013
    Applicant: AIR PRODUCTS AND CHEMICALS, INC.
    Inventors: Gauri Sankar Lal, Kristen Elaine Minnich, Pritesh G. Patel, Gamini Ananda Vedage, Garret C. Lau