Patents by Inventor Yian Chang

Yian Chang 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).

  • Publication number: 20070211990
    Abstract: A plasma lamp for an electrodeless plasma lamp having a waveguide body with an effective dielectric constant of at least 2. A drive probe is coupled to the waveguide body to provide the primary power for ignition and steady state operation of the lamp. A phase shifter is used to adjust the phase of the power provided to the drive probe between ignition and steady state operation. The phase shifter may also be used to adjust brightness during steady state operation.
    Type: Application
    Filed: October 27, 2006
    Publication date: September 13, 2007
    Inventors: Frederick Espiau, Yian Chang, Frederick Espiau, Marc DeVincentis
  • Publication number: 20070109069
    Abstract: A plasma lamp including a waveguide body including at least one dielectric material with a dielectric constant greater than approximately 2. The body is coupled to a microwave source which causes the body to resonate in at least one resonant mode. At least one lamp chamber integrated with the body contains a bulb with a fill forming a light-emitting plasma when the chamber receives power from the resonating body. A bulb either is self-enclosed or an envelope sealed by a window or lens covering the chamber aperture. Embodiments disclosed include lamps having a drive probe and a feedback probe, and lamps having a drive probe, feedback probe and start probe, which minimize power reflected from the body back to the source both before each plasma is formed and after it reaches steady state.
    Type: Application
    Filed: December 29, 2006
    Publication date: May 17, 2007
    Inventors: Frederick ESPIAU, Yian Chang
  • Publication number: 20070001614
    Abstract: A dielectric waveguide integrated plasma lamp (DWIPL) with a body consisting essentially of at least one dielectric material having a dielectric constant greater than approximately 2, and having a shape and dimensions such that the body resonates in at least one resonant mode when microwave energy of an appropriate frequency is coupled into the body. A bulb positioned in at least one lamp chamber in the body contains a gas-fill which when receiving energy from the resonating body forms a light-emitting plasma.
    Type: Application
    Filed: March 18, 2005
    Publication date: January 4, 2007
    Inventors: Frederick Espiau, Chandrashekhar Joshi, Yian Chang
  • Publication number: 20060208648
    Abstract: A dielectric waveguide integrated plasma lamp is disclosed for powering a small and bright bulb with a diameter of a few millimeters. The lamp is contained within a high dielectric constant material which guides the microwaves to the bulb, provides heat isolation to the drive circuit, contains the microwaves, provides structural stability and ease of manufacturing and allows efficient energy coupling to the bulb when used as a dielectric resonant oscillator.
    Type: Application
    Filed: March 18, 2005
    Publication date: September 21, 2006
    Inventors: Frederick Espiau, Chandrashekhar Joshi, Yian Chang
  • Publication number: 20060208645
    Abstract: A dielectric waveguide integrated plasma lamp (DWIPL) with a body consisting essentially of at least one dielectric material having a dielectric constant greater than approximately 2, and having a shape and dimensions such that the body resonates in at least one resonant mode when microwave energy of an appropriate frequency is coupled into the body. A bulb positioned in at least one lamp chamber in the body contains a gas-fill which when receiving energy from the resonating body forms a light-emitting plasma.
    Type: Application
    Filed: March 18, 2005
    Publication date: September 21, 2006
    Inventors: Frederick Espiau, Chandrashekhar Joshi, Yian Chang
  • Publication number: 20060208647
    Abstract: A dielectric waveguide integrated plasma lamp is disclosed for powering a small. and bright bulb with a diameter of a few millimeters. The lamp is contained within a high dielectric constant material which guides the microwaves to the bulb, provides heat isolation to the drive circuit, contains the microwaves, provides structural stability and ease of manufacturing and allows efficient energy coupling to the bulb when used as a dielectric resonant oscillator.
    Type: Application
    Filed: March 18, 2005
    Publication date: September 21, 2006
    Inventors: Frederick Espiau, Chandrashekhar Joshi, Yian Chang
  • Publication number: 20060208646
    Abstract: A dielectric waveguide integrated plasma lamp is disclosed for powering a small and bright bulb with a diameter of a few millimeters. The lamp is contained within a high dielectric constant material which guides the microwaves to the bulb, provides heat isolation to the drive circuit, contains the microwaves, provides structural stability and ease of manufacturing and allows efficient energy coupling to the bulb when used as a dielectric resonant oscillator.
    Type: Application
    Filed: March 18, 2005
    Publication date: September 21, 2006
    Inventors: Frederick Espiau, Chandrashekhar Joshi, Yian Chang
  • Publication number: 20050248281
    Abstract: A dielectric waveguide integrated plasma lamp (DWIPL) with a body consisting essentially of at least one dielectric material having a dielectric constant greater than approximately 2, and having a shape and dimensions such that the body resonates in at least one resonant mode when microwave energy of an appropriate frequency is coupled into the body. A bulb positioned in at least one lamp chamber in the body contains a gas-fill which when receiving energy from the resonating body forms a light-emitting plasma.
    Type: Application
    Filed: March 18, 2005
    Publication date: November 10, 2005
    Inventors: Frederick Espiau, Chandrashekhar Joshi, Yian Chang
  • Publication number: 20050212456
    Abstract: A plasma lamp including a waveguide body comprising at least one dielectric material. The body is coupled to a microwave power source which causes the body to resonate in at least one resonant mode. A lamp chamber integrated with the body contains a bulb with a fill forming a light-emitting plasma when the chamber receives power from the resonating body. A bulb either is self-enclosed or an envelope sealed by a window or lens covering the chamber aperture. Embodiments disclosed include lamps having a drive probe and a feedback probe, and lamps having a drive probe, feedback probe and start probe, which minimize power reflected from the body back to the source.
    Type: Application
    Filed: May 23, 2005
    Publication date: September 29, 2005
    Inventors: Frederick Espiau, Yian Chang
  • Patent number: 6922021
    Abstract: A plasma lamp including a waveguide body consisting essentially of at least one dielectric material having a dielectric constant greater than approximately 2. The body is coupled to a microwave power source which causes the body to resonate in at least one resonant mode. At least one lamp chamber integrated with the body contains a bulb with a fill forming a light-emitting plasma when the chamber receives power from the resonating body. A bulb either is self-enclosed or an envelope sealed by a window or lens covering the chamber aperture.
    Type: Grant
    Filed: January 31, 2003
    Date of Patent: July 26, 2005
    Assignee: Luxim Corporation
    Inventors: Frederick M. Espiau, Yian Chang
  • Publication number: 20050099130
    Abstract: A plasma lamp including a waveguide body consisting essentially of at least one solid dielectric material. The body is coupled to a microwave power source which causes the body to resonate in at least one resonant mode. A lamp chamber integrated into the body contains a fill mixture which forms a light-emitting plasma when the chamber receives microwave power from the resonating waveguide body. The chamber has an aperture sealed to the external environment by a window or lens allowing light to be transmitted. Alternatively, the fill is in a self-enclosed bulb positioned in the chamber. Embodiments disclosed include lamps having a drive probe and a feedback probe, and lamps having a drive probe, feedback probe and start probe, which minimize power reflected from the body back to the source both before the plasma is formed and after it reaches steady state.
    Type: Application
    Filed: December 11, 2004
    Publication date: May 12, 2005
    Inventors: Frederick Espiau, Yian Chang
  • Publication number: 20050057158
    Abstract: A dielectric waveguide integrated plasma lamp (DWIPL) with a body comprising at least one dielectric material having a dielectric constant greater than approximately 2, and having a shape and dimensions such that the body resonates in at least one resonant mode when microwave energy of an appropriate frequency is coupled into the body. A dielectric bulb within a lamp chamber in the body contains a fill which when receiving energy from the resonating body forms a light-emitting plasma. The bulb is transparent to visible light and infrared radiation emitted by the plasma. Radiative energy lost from the plasma is recycled by reflecting the radiation from thin-film, multi-layer coatings on bulb exterior surfaces and/or lamp chamber surfaces back into the bulb.
    Type: Application
    Filed: September 23, 2004
    Publication date: March 17, 2005
    Inventors: Yian Chang, Frederick Espiau
  • Publication number: 20040155589
    Abstract: A dielectric waveguide integrated plasma lamp (DWIPL) with a body consisting essentially of at least one dielectric material having a dielectric constant greater than approximately 2, and having a shape and dimensions such that the body resonates in at least one resonant mode when microwave energy of an appropriate frequency is coupled into the body. A bulb positioned in at least one lamp chamber in the body contains a gas-fill which when receiving energy from the resonating body forms a light-emitting plasma.
    Type: Application
    Filed: February 4, 2004
    Publication date: August 12, 2004
    Inventors: Frederick M. Espiau, Chandrashekhar J. Joshi, Yian Chang
  • Patent number: 6737809
    Abstract: A dielectric waveguide integrated plasma lamp (DWIPL) with a body consisting essentially of at least one dielectric material having a dielectric constant greater than approximately 2, and having a shape and dimensions such that the body resonates in at least one resonant mode when microwave energy of an appropriate frequency is coupled into the body. A bulb positioned in a cavity within the body contains a gas-fill which when receiving energy from the resonating body forms a light-emitting plasma.
    Type: Grant
    Filed: March 15, 2001
    Date of Patent: May 18, 2004
    Assignee: Luxim Corporation
    Inventors: Frederick M. Espiau, Chandrashekhar J. Joshi, Yian Chang
  • Publication number: 20030178943
    Abstract: A plasma lamp including a waveguide body consisting essentially of at least one solid dielectric material. The body is coupled to a microwave power source which causes the body to resonate in at least one resonant mode. A lamp chamber integrated into the body contains a fill which forms a light-emitting plasma when the chamber receives microwave power from the resonating waveguide body. The lamp has an aperture sealed to the external environment, thereby sealing the chamber but allowing light to be transmitted. Embodiments disclosed include lamps having a drive probe and a feedback probe, and lamps having a drive probe, feedback probe and start probe, which minimize power reflected from the body back to the source both before the plasma is formed and after it reaches steady state.
    Type: Application
    Filed: January 31, 2003
    Publication date: September 25, 2003
    Inventors: Frederick M. Espiau, Yian Chang
  • Publication number: 20020011802
    Abstract: A dielectric waveguide integrated plasma lamp is disclosed for powering a small and bright bulb with a diameter of a few millimeters. The lamp is contained within a high dielectric constant material which guides the microwaves to the bulb, provides heat isolation to the drive circuit, contains the microwaves, provides structural stability and ease of manufacturing and allows efficient energy coupling to the bulb when used as a dielectric resonant oscillator.
    Type: Application
    Filed: March 15, 2001
    Publication date: January 31, 2002
    Inventors: Frederick M. Espiau, Chandrashekhar J. Joshi, Yian Chang