Patents by Inventor Keith Bradshaw

Keith Bradshaw 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).

  • Methods for coupling solar cells
    Patent number: 12274100
    Abstract: Systems, methods and apparatus related to a multijunction solar cell. The apparatus comprises a first sub-solar cell, a second sub-solar cell in series with the first sub-solar cell and one or more quantum wells. At least some of the quantum wells are disposed in a region of the first sub-solar cell, and have a thickness and a bandgap sized such that a bandgap in selected quantum wells are less than a bandgap of a material of the first sub-solar cell and greater than a bandgap of a material of the second sub-solar cell resulting in radiative coupling between the first sub-solar cell and the second sub-solar cell.
    Type: Grant
    Filed: February 5, 2024
    Date of Patent: April 8, 2025
    Assignee: United States of America as represented by the Secretary of the Air Force
    Inventor: Geoffrey Keith Bradshaw
  • Systems, methods and apparatus for coupling solar cells
    Patent number: 11978813
    Abstract: Systems, methods and apparatus related to a multijunction solar cell. The apparatus comprises a first sub-solar cell, a second sub-solar cell in series with the first sub-solar cell and one or more quantum wells. At least some of the quantum wells are disposed in a region of the first sub-solar cell, and have a thickness and a bandgap sized such that a bandgap in selected quantum wells are less than a bandgap of a material of the first sub-solar cell and greater than a bandgap of a material of the second sub-solar cell resulting in radiative coupling between the first sub-solar cell and the second sub-solar cell.
    Type: Grant
    Filed: December 23, 2019
    Date of Patent: May 7, 2024
    Assignee: United States of America as represented by the Secretary of the Air Force
    Inventor: Geoffrey Keith Bradshaw
  • Positron beam lithography
    Patent number: 5262651
    Abstract: Resist (402) is exposed by a beam of positrons (320) in an apparatus (300) similar to an electron beam lithography machine.
    Type: Grant
    Filed: September 4, 1992
    Date of Patent: November 16, 1993
    Assignee: Texas Instruments Incorporated
    Inventors: Keith Bradshaw, Gary A. Frazier
  • Positron beam lithography
    Patent number: 5175075
    Abstract: Resist (402) is exposed by a beam of positrons (320) is an apparatus (300) similar to an electron beam lithography machine.
    Type: Grant
    Filed: November 30, 1989
    Date of Patent: December 29, 1992
    Assignee: Texas Instruments Incorporated
    Inventors: Gary A. Frazier, Keith Bradshaw
  • Lithographic method
    Patent number: 5112724
    Abstract: An electron beam lithography method with multiple low-dose scans by an electron beam (320) exposes a resist (402) pattern.
    Type: Grant
    Filed: November 30, 1989
    Date of Patent: May 12, 1992
    Assignee: Texas Instruments Incorporated
    Inventor: Keith Bradshaw
  • LED light-fixture module
    Patent number: D638976
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: May 31, 2011
    Assignee: Speirs and Major Associates Limited
    Inventors: Andrew Howis, Keith Bradshaw, Benz Roos, Mark Major
  • LED light fixture with cross-mounted modules
    Patent number: D639483
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: June 7, 2011
    Assignee: Speirs and Major Associated Limited
    Inventors: Andrew Howis, Keith Bradshaw, Benz Roos, Mark Major
  • Multi-module LED light-fixture
    Patent number: D645189
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: September 13, 2011
    Assignee: Speirs & Major Associates Limited
    Inventors: Andrew Howis, Keith Bradshaw, Benz Roos, Mark Major
  • Multi-module LED light-fixture with sharp-edged mounting arm
    Patent number: D655434
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: March 6, 2012
    Assignee: Speirs and Major Associates Limited
    Inventors: Andrew Howis, Keith Bradshaw, Benz Roos, Mark Major
  • LED light fixture with cross-mounted modules and mounting arm
    Patent number: D655435
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: March 6, 2012
    Assignee: Speirs and Major Associates Limited
    Inventors: Andrew Howis, Keith Bradshaw, Benz Roos, Mark Major