Patents by Inventor Brian K. Stewart

Brian K. Stewart 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).

  • Structural joint with multi-axis load carrying capability
    Patent number: 9546678
    Abstract: A structural joint is formed of a mandrel having a plurality of bumps and dimples formed thereon which is fitted into a sleeve. The bumps and dimples form a non-circular geometry at all points along the length of the mandrel. The bumps are defined by surfaces which have 1st and 2nd derivatives which are continuous.
    Type: Grant
    Filed: December 13, 2013
    Date of Patent: January 17, 2017
    Assignee: THE UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR OF THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
    Inventors: K. Chauncey Wu, Robert A. Martin, Brian K. Stewart
  • Structural Joint With Multi-Axis Load Carrying Capability
    Publication number: 20150252837
    Abstract: A structural joint is formed of a mandrel having a plurality of bumps and dimples foamed thereon which is fitted into a sleeve. The bumps and dimples form a non-circular geometry at all points along the length of the mandrel. The bumps are defined by surfaces which have 1st and 2nd derivatives which are continuous.
    Type: Application
    Filed: December 13, 2013
    Publication date: September 10, 2015
    Applicant: U.S.A. as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: K. Chauncey Wu, Robert A. Martin, Brian K. Stewart
  • Asymmetric dielectric elastomer composite material
    Patent number: 8704423
    Abstract: Embodiments of the invention provide a dielectric elastomer composite material comprising a plurality of elastomer-coated electrodes arranged in an assembly. Embodiments of the invention provide improved force output over prior DEs by producing thinner spacing between electrode surfaces. This is accomplished by coating electrodes directly with uncured elastomer in liquid form and then assembling a finished component (which may be termed an actuator) from coated electrode components.
    Type: Grant
    Filed: August 19, 2009
    Date of Patent: April 22, 2014
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Brian K. Stewart
  • Thin-film evaporative cooling for side-pumped laser
    Patent number: 7760778
    Abstract: A system and method are provided for cooling a crystal rod of a side-pumped laser. A transparent housing receives the crystal rod therethrough so that an annular gap is defined between the housing and the radial surface of the crystal rod. A fluid coolant is injected into the annular gap such the annular gap is partially filled with the fluid coolant while the radial surface of the crystal rod is wetted as a thin film all along the axial length thereof.
    Type: Grant
    Filed: February 1, 2007
    Date of Patent: July 20, 2010
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Brian K. Stewart
  • Asymmetric Dielectric Elastomer Composite Material
    Publication number: 20100044069
    Abstract: Embodiments of the invention provide a dielectric elastomer composite material comprising a plurality of elastomer-coated electrodes arranged in an assembly. Embodiments of the invention provide improved force output over prior DEs by producing thinner spacing between electrode surfaces. This is accomplished by coating electrodes directly with uncured elastomer in liquid form and then assembling a finished component (which may be termed an actuator) from coated electrode components.
    Type: Application
    Filed: August 19, 2009
    Publication date: February 25, 2010
    Applicant: USA as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Brian K. Stewart
  • Thin-Film Evaporative Cooling For Side-Pumped Laser
    Publication number: 20070206648
    Abstract: A system and method are provided for cooling a crystal rod of a side-pumped laser. A transparent housing receives the crystal rod therethrough so that an annular gap is defined between the housing and the radial surface of the crystal rod. A fluid coolant is injected into the annular gap such the annular gap is partially filled with the fluid coolant while the radial surface of the crystal rod is wetted as a thin film all along the axial length thereof.
    Type: Application
    Filed: February 1, 2007
    Publication date: September 6, 2007
    Applicant: U.S.A. as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Brian K. Stewart
  • Method and system for measuring gate valve clearances and seating force
    Patent number: 5487302
    Abstract: Valve clearances and seating force, as well as other valve operational parameters, are determined by measuring valve stem rotation during opening and closing operations of a translatable gate valve. The magnitude of the stem rotation, and the relative difference between the stem rotation on opening and closing provides valuable data on the valve internals in a non-intrusive manner.
    Type: Grant
    Filed: February 28, 1995
    Date of Patent: January 30, 1996
    Assignee: Lockheed Martin Energy Systems, Inc.
    Inventors: Donald A. Casada, Howard D. Haynes, John C. Moyers, Brian K. Stewart