Patents by Inventor William R. McGrath

William R. McGrath 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).

  • Patent number: 8232866
    Abstract: Systems and methods for remote, long standoff biometric identification using microwave cardiac signals are provided. In one embodiment, the invention relates to a method for remote biometric identification using microwave cardiac signals, the method including generating and directing first microwave energy in a direction of a person, receiving microwave energy reflected from the person, the reflected microwave energy indicative of cardiac characteristics of the person, segmenting a signal indicative of the reflected microwave energy into a waveform including a plurality of heart beats, identifying patterns in the microwave heart beats waveform, and identifying the person based on the identified patterns and a stored microwave heart beats waveform.
    Type: Grant
    Filed: December 23, 2010
    Date of Patent: July 31, 2012
    Assignee: California Institute of Technology
    Inventors: William R. McGrath, Ashit Talukder
  • Publication number: 20120068819
    Abstract: Systems and methods for remote, long standoff biometric identification using microwave cardiac signals are provided. In one embodiment, the invention relates to a method for remote biometric identification using microwave cardiac signals, the method including generating and directing first microwave energy in a direction of a person, receiving microwave energy reflected from the person, the reflected microwave energy indicative of cardiac characteristics of the person, segmenting a signal indicative of the reflected microwave energy into a waveform including a plurality of heart beats, identifying patterns in the microwave heart beats waveform, and identifying the person based on the identified patterns and a stored microwave heart beats waveform.
    Type: Application
    Filed: December 23, 2010
    Publication date: March 22, 2012
    Inventors: William R. McGrath, Ashit Talukder
  • Patent number: 7889053
    Abstract: A system to remotely identify a person by utilizing a microwave cardiogram, where some embodiments segment a signal representing cardiac beats into segments, extract features from the segments, and perform pattern identification of the segments and features with a pre-existing data set. Other embodiments are described and claimed.
    Type: Grant
    Filed: April 5, 2007
    Date of Patent: February 15, 2011
    Assignee: California Institute of Technology
    Inventors: William R. McGrath, Ashit Talukder
  • Patent number: 7811234
    Abstract: A remote-detection system is provided for monitoring changes in permittivity associated with physiological activity of a subject that is free to move. The system includes a source containing an oscillator configured to illuminate tissue of the subject with an electromagnetic signal beam. The system further includes a receiver configured to receive reflections of the electromagnetic signal beam from the subject. The reflections include amplitude variations indicative of motion of the illuminated tissue and amplitude variations indicative of time dependent variations in the permittivity of the illuminated tissue associated with electrical activity of the subject's heart.
    Type: Grant
    Filed: August 30, 2007
    Date of Patent: October 12, 2010
    Assignee: California Institute of Technology
    Inventor: William R. McGrath
  • Publication number: 20090303720
    Abstract: An arrangement of a multiplicity of LEDs, drive circuitry, and supporting structure to form a replacement for standard fluorescent tubes without the need to rewire or remove the magnetic or electronic ballasts in use in standard fluorescent fixtures.
    Type: Application
    Filed: August 3, 2009
    Publication date: December 10, 2009
    Applicant: LEDDYNAMICS, INC.
    Inventor: William R. McGrath
  • Patent number: 7272431
    Abstract: Apparatus and methods for performing remote detection of physiological activity are described. One aspect of the invention involves obtaining information concerning respiration and heart function. In one embodiment, the invention includes a source containing an oscillator configured to illuminate the subject with electromagnetic signal beam and a receiver configured to observe changes in the amplitude of the electromagnetic signal reflected by the subject.
    Type: Grant
    Filed: August 1, 2003
    Date of Patent: September 18, 2007
    Assignee: California Institute of Technology
    Inventor: William R. McGrath
  • Patent number: 7015650
    Abstract: A circuit device for providing energy to at least one electrical component, such as a light emitting diode (LED). The circuit device comprises a positive contact, an inductor, a diode and a negative contact in series. A first component contact for electrical connection to a cathode end of an electrical component, a second component contact for electrical connection to an anode end of an electrical component, a switch and a control device are also included. The first component contact is electrically connected to a junction between the positive contact and one end of the inductor; and the second component contact is electrically connected to a cathode end of the diode. There are also provided a circuit device further including an LED, an assembly including a circuit device and a bulb base, a flashlight including an assembly, and a method of directly replacing a flashlight bulb.
    Type: Grant
    Filed: March 1, 2004
    Date of Patent: March 21, 2006
    Assignee: LEDdynamics
    Inventor: William R. McGrath
  • Publication number: 20040189262
    Abstract: A circuit device for providing energy to at least one electrical component, such as a light emitting diode (LED). The circuit device comprises a positive contact, an inductor, a diode and a negative contact in series. A first component contact for electrical connection to a cathode end of an electrical component, a second component contact for electrical connection to an anode end of an electrical component, a switch and a control device are also included. The first component contact is electrically connected to a junction between the positive contact and one end of the inductor; and the second component contact is electrically connected to a cathode end of the diode. There are also provided a circuit device further including an LED, an assembly including a circuit device and a bulb base, a flashlight including an assembly, and a method of directly replacing a flashlight bulb.
    Type: Application
    Filed: March 1, 2004
    Publication date: September 30, 2004
    Applicant: LEDdynamics
    Inventor: William R. McGrath
  • Publication number: 20040123667
    Abstract: Apparatus and methods for performing remote detection of physiological activity are described. One aspect of the invention involves obtaining information concerning respiration and heart function. In one embodiment, the invention includes a source containing an oscillator configured to illuminate the subject with electromagnetic signal beam and a receiver configured to observe changes in the amplitude of the electromagnetic signal reflected by the subject.
    Type: Application
    Filed: August 1, 2003
    Publication date: July 1, 2004
    Inventor: William R. McGrath
  • Patent number: 6636003
    Abstract: An LED arrangement which produces a color temperature adjustable white light. The LED arrangement includes one or more white LEDs and a first drive circuit operable to supply a first drive current to the one or more white LEDs such that a white light is output at a desired intensity. The LED arrangement further includes one or more colored LEDs arranged such that a light output from the one or more colored LEDs combines with the white light to produce a resultant light having a desired color temperature. The colored LEDs are driven by a second drive circuit which supplies a second drive current to the one or more colored LEDs such that a colored light is output at a desired intensity, the intensity of the colored light output from the one or more colored LEDs being adjustable so as to adjust the color temperature of the resultant light.
    Type: Grant
    Filed: September 6, 2001
    Date of Patent: October 21, 2003
    Assignee: Spectrum Kinetics
    Inventors: Peter R. Rahm, William R. McGrath
  • Publication number: 20020048177
    Abstract: An LED arrangement which produces a color temperature adjustable white light. The LED arrangement includes one or more white LEDs and a first drive circuit operable to supply a first drive current to the one or more white LEDs such that a white light is output at a desired intensity. The LED arrangement further includes one or more colored LEDs arranged such that a light output from the one or more colored LEDs combines with the white light to produce a resultant light having a desired color temperature. The colored LEDs are driven by a second drive circuit which supplies a second drive current to the one or more colored LEDs such that a colored light is output at a desired intensity, the intensity of the colored light output from the one or more colored LEDs being adjustable so as to adjust the color temperature of the resultant light.
    Type: Application
    Filed: September 6, 2001
    Publication date: April 25, 2002
    Inventors: Peter R. Rahm, William R. McGrath
  • Patent number: 5138289
    Abstract: A noncontacting waveguide backshort is provided for use with frequencies of interest between 1 and 1000 GHz including a relatively rugged metallic bar movably mounted within the waveguide in a MYLAR insulator. A series of regularly shaped and spaced circular or rectangular openings are made in the metallic bar to form sections of high impedance alternating with sections of the bar having low impedance. This creates a periodic impedance variation which serves to provided an adjustable short circuit in a waveguide for the frequencies of interest.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: August 11, 1992
    Assignee: California Institute of Technology
    Inventor: William R. McGrath
  • Patent number: 5115217
    Abstract: A device for tuning a circuit includes a substrate, a transmission line on the substrate that includes first and second conductors coupled to a circuit to be tuned, and a movable short-circuit for varying the impedance the transmission line presents to the circuit to be tuned. The movable short-circuit includes a dielectric layer disposed atop the transmission line and a distributed shorting element in the form of a conductive member that is configured to be slid along at least a portion of the transmission line atop the dielectric layer. The conductive member is configured to span the first and second conductors of the transmission line and to define at least a first opening that spans the two conductors so that the conductive member includes first and second sections separated by the first opening.
    Type: Grant
    Filed: December 6, 1990
    Date of Patent: May 19, 1992
    Assignee: California Institute of Technology
    Inventors: William R. McGrath, Victor M. Lubecke