Patents by Inventor James Lawrence Booth

James Lawrence Booth 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).

  • Quantum pressure standard and methods for determining and using same
    Patent number: 11221268
    Abstract: A method determines a total velocity average cross-section parameter ?tot? in a relationship of the form ?loss(U)=nb?tot?·ƒ(U, Ud), where: ?loss(U) is a rate of exponential loss of sensor atoms from a cold atom sensor trap of trap depth potential energy U in a vacuum environment due to collisions with residual particles in the vacuum environment; nb is a number density of residual particles in the vacuum environment; Ud is a parameter given by U d = 2 ? k B ? T / m bg ? 4 ? ? ? ? ? 2 m t ? ? ? tot ? v ? which relates the masses of the sensor atoms mt and residual particles mbg to the total velocity average cross-section parameter ?tot?; and ƒ(U, Ud) is a function of the trap depth potential energy U and the parameter Ud which models a naturally occurring dependence of the loss rate ?loss(U) on the trap depth potential energy U and the parameter Ud, where ƒ(U=0, Ud) is unity for all Ud.
    Type: Grant
    Filed: July 23, 2019
    Date of Patent: January 11, 2022
    Assignees: The University of British Coumbia, British Columbia Institute of Technology
    Inventors: Kirk W. Madison, James Lawrence Booth, Pinrui Shen, Roman V. Krems
  • QUANTUM PRESSURE STANDARD AND METHODS FOR DETERMINING AND USING SAME
    Publication number: 20200025639
    Abstract: A method determines a total velocity average cross-section parameter ?tot? in a relationship of the form ?loss(U)=nb?tot?·ƒ(U, Ud), where: ?loss(U) is a rate of exponential loss of sensor atoms from a cold atom sensor trap of trap depth potential energy U in a vacuum environment due to collisions with residual particles in the vacuum environment; nb is a number density of residual particles in the vacuum environment; Ud is a parameter given by U d = 2 ? k B ? T / m bg ? 4 ? ? ? ? ? 2 m t ? ? ? tot ? v ? which relates the masses of the sensor atoms mt and residual particles mbg to the total velocity average cross-section parameter ?tot?; and ƒ(U, Ud) is a function of the trap depth potential energy U and the parameter Ud which models a naturally occurring dependence of the loss rate ?loss(U) on the trap depth potential energy U and the parameter Ud, where ƒ(U=0, Ud) is unity for all Ud.
    Type: Application
    Filed: July 23, 2019
    Publication date: January 23, 2020
    Inventors: Kirk W. MADISON, James Lawrence BOOTH, Pinrui SHEN, Roman V. KREMS
  • Method and device for accurately measuring the incident flux of ambient particles in a high or ultra-high vacuum environment
    Patent number: 8803072
    Abstract: An apparatus and method that can measure flux density in-situ under high vacuum conditions includes a means for confining a collection of identical, elemental sensor particles to a volume of space by initial cooling by laser or another method, then confinement in a sensor volume using externally applied magnetic and/or optical fields.
    Type: Grant
    Filed: May 26, 2011
    Date of Patent: August 12, 2014
    Assignee: British Columbia Institute of Technology
    Inventors: James Lawrence Booth, David Erik Fagnan, Bruce George Klappauf, Kirk William Madison, Jicheng Wang
  • METHOD AND DEVICE FOR ACCURATELY MEASURING THE INCIDENT FLUX OF AMBIENT PARTICLES IN A HIGH OR ULTRA-HIGH VACUUM ENVIRONMENT
    Publication number: 20110290991
    Abstract: An apparatus and method that can measure flux density in-situ under high vacuum conditions includes a means for confining a collection of identical, elemental sensor particles to a volume of space by initial cooling by laser or another method, then confinement in a sensor volume using externally applied magnetic and/or optical fields.
    Type: Application
    Filed: May 26, 2011
    Publication date: December 1, 2011
    Applicant: BRITISH COLUMBIA INSTITUTE OF TECHNOLOGY
    Inventors: James Lawrence Booth, David Erik Fagnan, Bruce George Klappauf, Kirk William Madison, Jicheng Wang