Patents by Inventor David James Anvar

David James Anvar 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).

  • Apparatus and method for detecting pupils
    Patent number: 7280678
    Abstract: Methods and apparatus for pupil detection are described. First light is emitted from a first light source at a first illumination angle relative to the axis of a detector. Second light is emitted from a second light source at a second illumination angle relative to the axis. The first light and the second light can have substantially equal intensities. The second illumination angle is greater than the first illumination angle. Reflected first light and reflected second light are received at the detector. The difference between the reflected first light and the reflected second light can be determined. The difference can be used to detect the pupils of a subject's eyes.
    Type: Grant
    Filed: February 28, 2003
    Date of Patent: October 9, 2007
    Assignee: Avago Technologies General IP Pte Ltd
    Inventors: Richard Earl Haven, David James Anvar, Julie Elizabeth Fouquet, John Stewart Wenstrand
  • Bubble stability in an optical switch
    Patent number: 6798939
    Abstract: Bubble stability within an optical switch is enhanced by controlling the expansion or movement of a bubble from a liquid-containing trench into available adjacent spacing. Typically, the adjacent spacing is formed between an optical waveguide substrate and a heater substrate, where the heater substrate includes a microheater for forming the bubble. The bubble enhancement is provided by intentionally altering surface features along at least one of the substrates.
    Type: Grant
    Filed: March 14, 2002
    Date of Patent: September 28, 2004
    Assignee: Agilent Technologies, Inc.
    Inventors: Frederick Austin Stawitcke, Shalini Venkatesh, Datong Chen, Richard Earl Haven, Mark Andrew Troll, David James Anvar
  • Apparatus and method for detecting pupils
    Publication number: 20040170304
    Abstract: Methods and apparatus for pupil detection are described. First light is emitted from a first light source at a first illumination angle relative to the axis of a detector. Second light is emitted from a second light source at a second illumination angle relative to the axis. The first light and the second light can have substantially equal intensities. The second illumination angle is greater than the first illumination angle. Reflected first light and reflected second light are received at the detector. The difference between the reflected first light and the reflected second light can be determined. The difference can be used to detect the pupils of a subject's eyes.
    Type: Application
    Filed: February 28, 2003
    Publication date: September 2, 2004
    Inventors: Richard Earl Haven, David James Anvar, Julie Elizabeth Fouquet, John Stewart Wenstrand
  • Bubble stability in an optical switch
    Publication number: 20030174930
    Abstract: Bubble stability within an optical switch is enhanced by controlling the expansion or movement of a bubble from a liquid-containing trench into available adjacent spacing. Typically, the adjacent spacing is formed between an optical waveguide substrate and a heater substrate, where the heater substrate includes a microheater for forming the bubble. The bubble enhancement is provided by intentionally altering surface features along at least one of the substrates.
    Type: Application
    Filed: March 14, 2002
    Publication date: September 18, 2003
    Inventors: Frederick Austin Stawitcke, Shalini Venkatesh, Datong Chen, Richard Earl Haven, Mark Andrew Troll, David James Anvar