Patents Assigned to Light Technologies, Inc.
  • Patent number: 6884646
    Abstract: An LED epitaxial structure and a first electrode layer are formed on a provisional substrate in sequence. Then, a metallic permanent substrate is formed on the first electrode layer, and the provisional substrate is removed to expose a surface of the LED epitaxial structure. A plurality of second electrodes is formed on the surface of the LED epitaxial structure. Finally, the metallic permanent substrate, the first electrode layer, and the LED epitaxial structure are diced to form a plurality of LED devices.
    Type: Grant
    Filed: March 10, 2004
    Date of Patent: April 26, 2005
    Assignee: Uni Light Technology Inc.
    Inventors: Bor-Jen Wu, Mei-Hui Wu, Chien-An Chen, Yuan-Hsiao Chang
  • Patent number: 6857926
    Abstract: The present invention is directed to methods of making arc tubes for high intensity discharge lamps. The bottom portion of the light emitting chamber of the arc tubes is flattened in an area between the electrodes to reduce the distance between the bottom wall of the arc tube and the arc, and to increase the surface area of the pool of condensed halides during operation of a metal halide lamp. The flattened bottom of the arc tubes may be generally planar, slightly arcuate longitudinally and/or transversely, or slightly v-shaped longitudinally and/or transversely. The top portion of the arc tube conforms generally to the shape of the arc during operation of the lamp.
    Type: Grant
    Filed: June 19, 2000
    Date of Patent: February 22, 2005
    Assignee: Advanced Lighting Technologies, Inc.
    Inventors: Juris Sulcs, Abbas Lamouri
  • Patent number: 6854864
    Abstract: An optical device for increasing the brightness of electromagnetic radiation emitted by a source by folding the electromagnetic radiation back on itself. The source of electromagnetic radiation has a first width, a first input end of a first light pipe has a second width, and a second input end of a second light pipe has a third width. An output end of the first light pipe may be reflective; while an output end of the second light pipe may be transmissive. The source is located substantially proximate to a first focal point of a reflector to produce rays of radiation that reflect from the reflector and substantially converge at a second focal point; and the input ends of the first and second light pipes are located proximate to the second focal point to collect the electromagnetic radiation.
    Type: Grant
    Filed: May 19, 2003
    Date of Patent: February 15, 2005
    Assignee: Cogent Light Technologies, Inc.
    Inventor: Kenneth K. Li
  • Patent number: 6853012
    Abstract: An AlGaInP light emitting diode with improved illumination is provided. The AlGaInP light emitting diode includes a semiconductor substrate, a light re-emitting layer, an AlGaInP layer with a first doping concentration, an AlGaInP lower cladding layer with a second doping concentration less than the first doping concentration, an undoped AlGaInP active layer, an AlGaInP upper cladding layer, a window layer, an annular-shaped top electrode on the window layer and a layered electrode on a bottom of the semiconductor substrate. The light re-emitting layer includes at least a first region formed of the light re-emitting layer and a second region formed of Al2O3 enclosing the first region. Since AlGaInP layer between the AlGaInP lower cladding layer and the light re-emitting layer has the first doping concentration larger than that of the AlGaInP lower cladding layer, the AlGaInP layer provides a transverse current spreading.
    Type: Grant
    Filed: October 21, 2002
    Date of Patent: February 8, 2005
    Assignee: Uni Light Technology Inc.
    Inventors: Nai-Chuan Chen, Yi-Lun Chou, Nae-Guann Yih
  • Publication number: 20040257654
    Abstract: A waveguide polarization recovery system both polarizes the input light energy for use with an LCD imager and converts the polarity of unusable light energy to add to the illumination of the LCD imager. The compact polarization recovery waveguide system generally includes: (1) an input waveguide that provides non-polarized light energy into the system; (2) an output waveguide that receives polarized light energy from the system; (3) a polarized beam splitter that received the light energy from the input waveguide and transmits lights energy of a first polarization type and reflects light energy of a second polarization type, and (4) a wave plate that modifies the polarization of either the transmitted or reflected light energy. The polarization recovery system also generally includes one or more mirrors that are positioned as need to direct the transmitted and the reflected light energy to the output waveguide. The input and output waveguides may be shaped as needed by the projection system.
    Type: Application
    Filed: May 21, 2004
    Publication date: December 23, 2004
    Applicant: Cogent Light Technologies, Inc.
    Inventor: Kenneth K. Li
  • Publication number: 20040258342
    Abstract: A waveguide polarization recovery system both polarizes the input light energy for use with an LCD imager and converts the polarity of unusable light energy to add to the illumination of the LCD imager. The compact polarization recovery waveguide system generally includes: (1) an input waveguide that provides non-polarized light energy into the system; (2) an output waveguide that receives polarized light energy from the system; (3) a polarized beam splitter that received the light energy from the input waveguide and transmits lights energy of a first polarization type and reflects light energy of a second polarization type, and (4) a wave plate that modifies the polarization of either the transmitted or reflected light energy. The polarization recovery system also generally includes one or more mirrors that are positioned as need to direct the transmitted and the reflected light energy to the output waveguide. The input and output waveguides may be shaped as needed by the projection system.
    Type: Application
    Filed: May 21, 2004
    Publication date: December 23, 2004
    Applicant: Cogent Light Technologies, Inc.
    Inventor: Kenneth K. Li
  • Publication number: 20040257653
    Abstract: A waveguide polarization recovery system both polarizes the input light energy for use with an LCD imager and converts the polarity of unusable light energy to add to the illumination of the LCD imager. The compact polarization recovery waveguide system generally includes: (1) an input waveguide that provides non-polarized light energy into the system; (2) an output waveguide that receives polarized light energy from the system; (3) a polarized beam splitter that received the light energy from the input waveguide and transmits lights energy of a first polarization type and reflects light energy of a second polarization type, and (4) a wave plate that modifies the polarization of either the transmitted or reflected light energy. The polarization recovery system also generally includes one or more mirrors that are positioned as need to direct the transmitted and the reflected light energy to the output waveguide. The input and output waveguides may be shaped as needed by the projection system.
    Type: Application
    Filed: May 21, 2004
    Publication date: December 23, 2004
    Applicant: Cogent Light Technologies, Inc.
    Inventor: Kenneth K. Li
  • Publication number: 20040257655
    Abstract: A waveguide polarization recovery system both polarizes the input light energy for use with an LCD imager and converts the polarity of unusable light energy to add to the illumination of the LCD imager. The compact polarization recovery waveguide system generally includes: (1) an input waveguide that provides non-polarized light energy into the system; (2) an output waveguide that receives polarized light energy from the system; (3) a polarized beam splitter that received the light energy from the input waveguide and transmits lights energy of a first polarization type and reflects light energy of a second polarization type, and (4) a wave plate that modifies the polarization of either the transmitted or reflected light energy. The polarization recovery system also generally includes one or more mirrors that are positioned as need to direct the transmitted and the reflected light energy to the output waveguide. The input and output waveguides may be shaped as needed by the projection system.
    Type: Application
    Filed: May 21, 2004
    Publication date: December 23, 2004
    Applicant: Cogent Light Technologies, Inc.
    Inventor: Kenneth K. Li
  • Patent number: 6833676
    Abstract: A solid halogen-containing lamp fill material and a method of introducing small amounts of halogen into a HID lamp are disclosed. The solid material may include an admixture of a metal and a metal halide in the form of spheres of high purity, uniform size and uniform composition. Solid lamp fill material and methods of introducing small quantities of one or more metals into a HID lamp are also disclosed.
    Type: Grant
    Filed: October 14, 2003
    Date of Patent: December 21, 2004
    Assignee: Advanced Lighting Technologies, Inc.
    Inventor: Timothy R. Brumleve
  • Patent number: 6830495
    Abstract: A solid halogen-containing lamp fill material and a method of introducing small amounts of halogen into a HID lamp are disclosed. The solid material may include an admixture of a metal and a metal halide in the form of spheres of high purity, uniform size and uniform composition. Solid lamp fill material and methods of introducing small quantities of one or more metals into a HID lamp are also disclosed.
    Type: Grant
    Filed: October 14, 2003
    Date of Patent: December 14, 2004
    Assignee: Advanced Lighting Technologies, Inc.
    Inventor: Timothy R. Brumleve
  • Publication number: 20040240057
    Abstract: A waveguide polarization recovery system both polarizes the input light energy for use with an LCD imager and converts the polarity of unusable light energy to add to the illumination of the LCD imager. The compact polarization recovery waveguide system generally includes: (1) an input waveguide that provides non-polarized light energy into the system; (2) an output waveguide that receives polarized light energy from the system; (3) a polarized beam splitter that received the light energy from the input waveguide and transmits lights energy of a first polarization type and reflects light energy of a second polarization type, and (4) a wave plate that modifies the polarization of either the transmitted or reflected light energy. The polarization recovery system also generally includes one or more mirrors that are positioned as need to direct the transmitted and the reflected light energy to the output waveguide. The input and output waveguides may be shaped as needed by the projection system.
    Type: Application
    Filed: June 30, 2004
    Publication date: December 2, 2004
    Applicant: Cogent Light Technologies, Inc.
    Inventor: Kenneth K. Li
  • Publication number: 20040240059
    Abstract: A waveguide polarization recovery system both polarizes the input light energy for use with an LCD imager and converts the polarity of unusable light energy to add to the illumination of the LCD imager. The compact polarization recovery waveguide system generally includes: (1) an input waveguide that provides non-polarized light energy into the system; (2) an output waveguide that receives polarized light energy from the system; (3) a polarized beam splitter that received the light energy from the input waveguide and transmits lights energy of a first polarization type and reflects light energy of a second polarization type, and (4) a wave plate that modifies the polarization of either the transmitted or reflected light energy. The polarization recovery system also generally includes one or more mirrors that are positioned as need to direct the transmitted and the reflected light energy to the output waveguide. The input and output waveguides may be shaped as needed by the projection system.
    Type: Application
    Filed: July 7, 2004
    Publication date: December 2, 2004
    Applicant: Cogent Light Technologies, Inc.
    Inventor: Kenneth K. Li
  • Publication number: 20040240058
    Abstract: A waveguide polarization recovery system both polarizes the input light energy for use with an LCD imager and converts the polarity of unusable light energy to add to the illumination of the LCD imager. The compact polarization recovery waveguide system generally includes: (1) an input waveguide that provides non-polarized light energy into the system; (2) an output waveguide that receives polarized light energy from the system; (3) a polarized beam splitter that received the light energy from the input waveguide and transmits lights energy of a first polarization type and reflects light energy of a second polarization type, and (4) a wave plate that modifies the polarization of either the transmitted or reflected light energy. The polarization recovery system also generally includes one or more mirrors that are positioned as need to direct the transmitted and the reflected light energy to the output waveguide. The input and output waveguides may be shaped as needed by the projection system.
    Type: Application
    Filed: July 7, 2004
    Publication date: December 2, 2004
    Applicant: Cogent Light Technologies, Inc.
    Inventor: Kenneth K. Li
  • Patent number: 6815888
    Abstract: A pelletized lamp fill material suitable for delivering a precise quantity of rhenium and a halogen into the light emitting chamber of a tungsten halogen lamp. The pellet is formed by pressure aggregating a mixture of a metal powder and a rhenium-halogen compound. In a pellet suitable for delivering bromine into the lamp, the metal powder may be mixed with rhenium tribromide powder to form the pellet. The release of the bromine and rhenium is desirably controlled over time as a function of temperature.
    Type: Grant
    Filed: February 14, 2001
    Date of Patent: November 9, 2004
    Assignee: Advanced Lighting Technologies, Inc.
    Inventor: Steven C. Hansen
  • Patent number: 6813125
    Abstract: A transformer assembly and method for powering a load with a secondary fault protected isolated secondary. The fault fault path is isolated from ground allowing voltage detection of faults and the return terminal is isolated from the midpoint for multiple load connection schemes using the midpoint as a ground connection. A power control system is connected between the primary winding and the input terminal with a ground fault detection circuit connected between the fault path and the ground terminal, where the ground fault detection circuit is operable to detect a fault and activate the power control system to disconnect the source of power from the primary winding in response to detecting the fault. Also disclosed is a high frequency filter adapted to reduce the effects of high frequency transients and a capacitive reactance connected between the input terminal means and the ground terminal. The capacitive reactance is adapted to provide a ground fault path for fault signals.
    Type: Grant
    Filed: July 1, 2002
    Date of Patent: November 2, 2004
    Assignee: Universal Lighting Technologies, Inc.
    Inventors: Gerald L. Ballard, Jr., Eric Bobbitt, Robert V. Burke, Daoshen Chen, Robert McCoy
  • Patent number: 6791280
    Abstract: A method of generating an electrical discharge in a high pressure gas contained in a sealed enclosure. The method includes driving a helical coil resonator at an RF frequency to generate an RF electric-magnetic field sufficient to generate an electrical discharge in the high pressure gas. The electrical discharge produces an emission spectrum that may be spectroscopically analyzed to determine the composition and impurity content of the gas.
    Type: Grant
    Filed: April 1, 2002
    Date of Patent: September 14, 2004
    Assignee: Advanced Lighting Technologies, Inc.
    Inventors: Ju Gao, Joseph T. Verdeyen
  • Patent number: 6791254
    Abstract: A fluorescent lamp containing zinc amalgam and a method of precisely controlling the amount of mercury introduced into a temperature controlled fluorescent lamp. Precise quantities of mercury may be introduced into a fluorescent lamp in the form of solid zinc amalgam pellets that are in a metastable, non-equilibrium state.
    Type: Grant
    Filed: January 15, 2002
    Date of Patent: September 14, 2004
    Assignee: Advanced Lighting Technologies, Inc.
    Inventors: Duane A. Stafford, Steven C. Hansen, Timothy R. Brumleve
  • Patent number: 6781312
    Abstract: The present invention is directed to horizontally burning formed-body arc tubes and arc tube blanks for high intensity discharge lamps. The bottom portion of the light emitting chamber of the arc tubes is flattened in an area between the electrodes to reduce the distance between the bottom wall of the arc tube and the arc, and to increase the surface area of the pool of condensed halides during operation of a metal halide lamp. The flattened bottom of the arc tubes may be generally planar, slightly arcuate longitudinally and/or transversely, or slightly v-shaped longitudinally and/or transversely. The top portion of the arc tube conforms generally to the shape of the arc during operation of the lamp.
    Type: Grant
    Filed: June 19, 2000
    Date of Patent: August 24, 2004
    Assignee: Advance Lighting Technologies, Inc.
    Inventors: Juris Sulcs, Abbas Lamouri, Bingwu Gu
  • Patent number: 6749478
    Abstract: A method of making an electric lamp having a gas filled outer jacket wherein the space enveloped by the jacket may be flushed and filled with the desired fill gas without the use of a mechanical evacuation system including an exhaust pump. The space may be flushed and filled to obtain a controlled atmosphere within the space by inserting a gas dispensing probe into the space to displace the uncontrolled atmosphere with the fill gas. The final pressure of the fill gas which is sealed within the space may be controlled by controlling the temperature of the fill gas during the flush/fill procedure until the outer jacket is sealed.
    Type: Grant
    Filed: October 11, 2001
    Date of Patent: June 15, 2004
    Assignee: Advance Lighting Technologies, Inc.
    Inventors: Abbas Lamouri, David Earl Bassett
  • Patent number: 6720741
    Abstract: Gas discharge lamps may conduct current from the common rail to earthen ground through a fixture containing the lamps. A transistor is coupled in series in the current path to the common rail. When the ballast is placed in a quiescent state, the transistor is rendered non-conducting, thereby solating the lamps from the common rail and preventing flicker. In accordance with another aspect of the invention, the control electrode of the transistor is coupled to a source of low voltage and the transistor is rendered non-conducting when the source of low voltage is turned off. The lamps can also be isolated from the common rail by using a semiconductor switch in the rectifier section or by referencing the output of the inverter to the high voltage rail.
    Type: Grant
    Filed: February 1, 2002
    Date of Patent: April 13, 2004
    Assignee: Universal Lighting Technologies, Inc.
    Inventors: Kent E. Crouse, Gueorgui L. Grouev, William L. Keith, Jacek Cachel