Patents by Inventor Kenneth Li

Kenneth Li 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: 20060061894
    Abstract: A condensing and collecting optical system includes a first reflector and second reflector. The first and second reflectors and includes a portion of an ellipsoid of revolution having two focal points and an optical axis. A source of electromagnetic radiation is placed at one of the focal points of the first reflector to produce radiation that converges at the second focal point of the first reflector. The second focal points of the reflectors coincide. The second reflector is positioned to receive the radiation after it passes through a second focal point of the second reflector and focuses the radiation toward a target positioned at the first focal point of the second reflector.
    Type: Application
    Filed: November 14, 2005
    Publication date: March 23, 2006
    Applicant: WAVIEN, INC.
    Inventor: Kenneth Li
  • Publication number: 20060056025
    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 light 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: November 9, 2005
    Publication date: March 16, 2006
    Inventor: Kenneth Li
  • Publication number: 20060044833
    Abstract: An illumination system including a plurality of lamps, a plurality of first light reflectors, a plurality of second light reflectors, and an output light guide. Each of the first light reflectors is arranged to reflect light output from one of the lamps onto an input of one of the second light reflectors, which in turn is arranged to direct light from an output of one the first light reflectors into an input of the output light guide, such that the outputs of each of the lamps is combined into a single output.
    Type: Application
    Filed: June 18, 2003
    Publication date: March 2, 2006
    Inventor: Kenneth Li
  • Publication number: 20060034086
    Abstract: An illumination system using filament lamps including a filament lamp, a reflector having a first and second focal points, the filament lamp disposed proximate to the first focal point of the reflector to emit rays of electromagnetic radiation that reflect from the reflector and converge substantially at the second focal point, wherein a portion of the electromagnetic radiation emitted by the filament lamp impinges directly on the reflector and a portion of the electromagnetic radiation does not impinge directly on the reflector and wherein the system further includes an additional reflector constructed and arranged to reflect at least part of the portion of the electromagnetic radiation that does not impinge directly on the reflector toward the reflector through the first focal point of the reflector.
    Type: Application
    Filed: August 19, 2005
    Publication date: February 16, 2006
    Inventor: Kenneth Li
  • Publication number: 20060034557
    Abstract: A polarization recovery system includes a polarizing beam splitter transmitting light of a useful polarization in an output direction and reflecting light of a non-useful polarization in a first orthogonal direction substantially orthogonal to the output direction. An initial reflector may reflect the non-useful polarization light in a second orthogonal direction substantially orthogonal to the output direction and the first orthogonal direction, and a final reflector may reflect the non-useful polarization light in the output direction. The non-useful polarization light may be rotated substantially to light of the useful polarization by the initial and final reflectors.
    Type: Application
    Filed: August 17, 2005
    Publication date: February 16, 2006
    Applicant: WAVIEN, INC.
    Inventors: Kenneth Li, Seiji Inatsugu
  • Publication number: 20060028724
    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: September 30, 2005
    Publication date: February 9, 2006
    Inventor: Kenneth Li
  • Publication number: 20050248958
    Abstract: An illumination engine for a projection display using light emitting diodes (LEDs) that includes a reflector having a first and second focal points, a source of electro-luminescence located proximate to the first focal point to emit rays of radiation in a first range of wavelengths that reflect from the reflector and converge substantially at the second focal point, and a light pipe having an first input end and a first output end, the first input end being located proximate to the second focal point to collect substantially all of the radiation and wherein the first output end transmits substantially all of the radiation.
    Type: Application
    Filed: June 14, 2005
    Publication date: November 10, 2005
    Inventor: Kenneth Li
  • Publication number: 20050213885
    Abstract: An optical coupling element for use in large numerical aperture collecting and condensing systems. The optical coupling element includes a curved surface such as a lens at the output of a tapered light pipe (TLP). The TLP in combination with the curved surface alters the divergence angle and the area of the light exiting the curved surface. Electromagnetic radiation emitted by a source is collected and focused onto a target by positioning the source of electromagnetic radiation substantially at a first focal point of a primary reflector so that the primary reflector produces rays of radiation reflected from the primary reflector that converge at a second focal point of the secondary reflector. The optical coupling element is positioned so that its input end is substantially proximate with the second focal point of the secondary reflector.
    Type: Application
    Filed: May 20, 2005
    Publication date: September 29, 2005
    Inventor: Kenneth Li
  • Publication number: 20050157388
    Abstract: A polarization recovery system polarizes input light for use with an LCD imager. The polarization recovery system converts light of the wrong polarity to the correct polarity to add to the illumination of the LCD imager. The polarization recovery system may include: (1) an output waveguide that receives polarized light energy from the system; (2) a polarized beam splitter that receives the light energy from the input waveguide, transmitting lights energy of a first polarization type and reflecting light energy of a second polarization type, and (3) a wave plate that modifies the polarization of either the transmitted or reflected light energy to that of the correct polarization. The polarization recovery system may include one or more “gaps” of optically clear material positioned between the optical components to encourage total internal reflection and minimize the loss of the optical energy.
    Type: Application
    Filed: February 18, 2005
    Publication date: July 21, 2005
    Applicant: Wavien, Inc.
    Inventor: Kenneth Li
  • Publication number: 20050106749
    Abstract: A system and method are provided for determining a concentration of an analyte in a material sample. The method includes providing a sample element with a sample chamber at least partially defined by at least one window formed from a material having greater than about 1% wavelength-domain variation in absorbtivity of electromagnetic radiation incident thereon. The method further includes employing the sample element with an analyte detection system which determines the concentration of the analyte with clinically acceptable accuracy.
    Type: Application
    Filed: June 25, 2004
    Publication date: May 19, 2005
    Inventors: James Braig, Bernhard Sterling, Peter Rule, Philip Hartstein, Kenneth Li
  • Publication number: 20050073653
    Abstract: A light recovery system for a projection display with a reflector having a first and a second focal points. A source of electromagnetic radiation is disposed proximate to the first focal point of the reflector to emit rays of radiation that reflect from the reflector and converge substantially at the second focal point. A retro-reflector reflects at least a portion of the electromagnetic radiation that does not impinge directly on the reflector toward the reflector through the first focal point of the reflector to increase the flux intensity of the converging rays. A light pipe with an input surface and an output surface is disposed with the input surface proximate to the second focal point to collect and transmit substantially all of the radiation. A first reflector is disposed proximate to the output surface to transmit a first band of radiation while reflecting a second and third bands of radiation.
    Type: Application
    Filed: November 24, 2004
    Publication date: April 7, 2005
    Applicant: Wavien, Inc.
    Inventor: Kenneth Li
  • Publication number: 20050063196
    Abstract: A light pipe based projection engine includes a X-prism transmitting substantially light of a useful polarization in an output direction and reflecting substantially light of a non-useful polarization in a first orthogonal direction substantially orthogonal to the output direction. An initial reflector may reflect the non-said low, said medium, and said high bands of wavelengths in a second orthogonal direction substantially orthogonal to the output direction and the first orthogonal direction, and a final reflector may reflect the non-said low, said medium, and said high bands of wavelengths in the output direction. The non-said low, said medium, and said high bands of wavelengths may be rotated substantially to light of the useful polarization by the initial and final reflectors.
    Type: Application
    Filed: June 9, 2004
    Publication date: March 24, 2005
    Applicant: Wavien, Inc.
    Inventor: Kenneth Li
  • Publication number: 20050047723
    Abstract: An optical coupling element for use in large numerical aperture collecting and condensing systems. The optical coupling element includes a curved surface such as a lens at the output of a tapered light pipe (TLP). The TLP in combination with the curved surface alters the divergence angle and the area of the light exiting the curved surface. Electromagnetic radiation emitted by a source is collected and focused onto a target by positioning the source of electromagnetic radiation substantially at a first focal point of a primary reflector so that the primary reflector produces rays of radiation reflected from the primary reflector that converge at a second focal point of the secondary reflector. The optical coupling element is positioned so that its input end is substantially proximate with the second focal point of the secondary reflector.
    Type: Application
    Filed: September 28, 2004
    Publication date: March 3, 2005
    Inventor: Kenneth Li
  • Publication number: 20050037384
    Abstract: Disclosed herein is a system for estimating the concentration of an analyte in a material sample. The system comprises a source of electromagnetic radiation; a detector positioned to detect radiation emitted by the source, so that the source and the detector define an optical path therebetween; and a sample element configured to be positioned in the optical path. The sample element comprises a sample chamber at least partially defined by opposed first and second windows which are substantially transmissive of at least a portion of the radiation emitted by the source, and which define an optical pathlength through the sample element. The sample chamber has an internal volume of less than 2 microliters. When the material sample is positioned in the sample chamber and the sample chamber is positioned in the optical path, the system computes estimated concentrations of the analyte in the material sample.
    Type: Application
    Filed: April 15, 2004
    Publication date: February 17, 2005
    Inventors: James Braig, Michael Munrow, Kenneth Witte, Mark Wechsler, Jennifer Gable, Igor Nemchuk, Peng Zheng, Kenneth Li, Maria Isaac, Robert Gaffney, Ronald Leguidleguid, Fiona Sander
  • Publication number: 20030225842
    Abstract: A method utilizing a computer for distributing a preselected message using electronic mail addresses stored on a user device. The method includes receiving a request to send the preselected message to e-mail addresses stored on the user device, retrieving e-mail addresses stored on the user device, and sending the preselected message to the e-mail addresses retrieved from the user device.
    Type: Application
    Filed: February 3, 2003
    Publication date: December 4, 2003
    Inventors: Kenneth Li, Daniel Kwoh
  • Patent number: 5778681
    Abstract: The present invention is an improved modular cooling device for cooling gas chromatography analyte sample injectors. The invention is embodied in a series of tubes connected in fluid communication from a coolant supply valve to the injector heating block. A flexible supply tube capable of carrying coolant while maintaining structural integrity at temperatures up to about 150.degree. C., and having a low thermal conductivity is connected in fluid connection with a coolant supply at one end, and a transition tube at the other. A transition tube, in fluid communication with the supply tube at one end and with the cooling tube at the other, is selected to maintain structural integrity at temperatures up to 450.degree. C. and to have a low thermal conductivity. The cooling tube is in fluid communication with the transition tube at a receiving end and with an exhaust at an exhaust end, and has an outer surface that is physically engageable with a surface of the heating block.
    Type: Grant
    Filed: April 15, 1997
    Date of Patent: July 14, 1998
    Assignee: Varian Associates, Inc.
    Inventors: Kenneth Li, John Robinson
  • Patent number: 5761356
    Abstract: A method and apparatus for coupling high intensity light into a low melting temperature optical fiber which uses a high temperature, low NA optical fiber as a spatial filter between a source of high intensity light and a low melting temperature, low NA optical fiber. The source of light may be a high intensity arc lamp or may be a high NA, high melting temperature optical fiber transmitting light from a remote light source.
    Type: Grant
    Filed: August 19, 1996
    Date of Patent: June 2, 1998
    Assignee: Cogent Light Technologies, Inc.
    Inventor: Kenneth Li
  • Patent number: 5709459
    Abstract: A luminaire for use during a medical procedure utilizes a single optic fiber for providing a beam of light having an initial beam width and an initial beam energy. The width of the beam is adjustable without substantially decreasing the beam energy, and the beam of adjusted width can be directed onto a surgical field. A headband for mounting a luminaire is formed of a perspiration-absorbent cloth strip, has hook-and-clasp engagement, and includes a luminaire mount.
    Type: Grant
    Filed: December 1, 1994
    Date of Patent: January 20, 1998
    Assignee: Cogent Light Technologies, Inc.
    Inventors: Zafirios Gourgouliatos, Mark D. Hopler, Kenneth Li
  • Patent number: 5707131
    Abstract: An electromagnetic radiation collecting and condensing optical system includes a number of cascaded concave reflectors and a number of electromagnetic radiation or light sources which radiate light energy onto the concave reflectors in such manner that the energy from each source is combined by the reflectors into a single output which is used to illuminate a target, such as a single core optical fiber.
    Type: Grant
    Filed: January 24, 1996
    Date of Patent: January 13, 1998
    Assignee: Cogent Light Technologies, Inc.
    Inventor: Kenneth Li
  • Patent number: 5642456
    Abstract: The present invention provides a variable attenuator for an optical transmission system having a disc-like masking plate with apertures (or image zones) formed in an arcuate control area at the periphery of the plate. Within each aperture, at least one opaque masking member is provided extending outward from the origin to the perimeter of the aperture and having a masking surface with an incremental masking area which continuously increases in magnitude with increasing radial length of the aperture. The perpendicular cross-section of each masking member with respect to the optical axis preferably forms a geometric shape having straight-line edges extending radially outward from the origin of the aperture. In the preferred embodiment, a plurality of masking members are utilized (as a pair or sets of pairs).
    Type: Grant
    Filed: September 14, 1993
    Date of Patent: June 24, 1997
    Assignee: Cogent Light Technologies, Inc.
    Inventors: Glenn Baker, Douglas Brenner, Zafirios Gourgouliatos, Kenneth Li, Karlheinz Strobl