Patents by Inventor Wai-Lam Chu

Wai-Lam Chu 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: 6357894
    Abstract: A lighting fixture utilizing a housing surrounding a fluorescent light source. The housing has an aperture defining an edge portion for determining the cutoff angle of light emanating from the source. A first upper reflector is formed on the inner surface of the housing directing light from the source at angles ranging between the cutoff angle and angles less than the cutoff angle. The second reflector, located adjacent first reflector in the housing between the housing aperture and the first reflector, directs light from the source ranging between a selected angle, which is less than the cutoff angle, and at angles less than the selected angle. The result is a lighting fixture which possesses an optical delay in the activation in the second reflector as one approaches the optical axis from a peripheral position.
    Type: Grant
    Filed: May 20, 1999
    Date of Patent: March 19, 2002
    Assignee: Prescolite, Inc.
    Inventors: Wai-Lam Chu, Chris Latsis
  • Patent number: 6033093
    Abstract: A lighting device employing a source of light which emanates to a first reflector which is positioned outwardly from such source. A second reflector at least partially surrounds the light source and is formed in spaced relationship with the first reflector to create a first gap between the first and second reflectors. The second reflector includes an opening which permits light from the source to pass to the first reflector and outwardly from the lighting device through the first gap. A light interacting element is formed outwardly from the source and is spaced from the second reflector to form a second gap. The second reflector is, thus, positioned between the first reflector and the light interacting element. Light interacting element further receives light from the source and either reflects or diffuses light outwardly from the lighting device.
    Type: Grant
    Filed: January 2, 1998
    Date of Patent: March 7, 2000
    Assignee: Precolite-Moldcast Lighting Company
    Inventors: Chris Latsis, Wai-Lam Chu
  • Patent number: 5918969
    Abstract: A lighting fixture utilizing a housing surrounding a fluorescent light source. The housing has an aperture defining an edge portion for determining the cutoff angle of light emanating from the source. A first upper reflector is formed on the inner surface of the housing, directing light from the source at angles ranging between the cutoff angle and angles less than the cutoff angle. The second reflector, located adjacent first reflector in the housing between the housing aperture and the first reflector, directs light from the source ranging between a selected angle, which is less than the cutoff angle, and at angles less than the selected angle. The result is a lighting fixture which possesses an optical delay in the activation in the second reflector as one approaches the optical axis from a peripheral position.
    Type: Grant
    Filed: August 27, 1997
    Date of Patent: July 6, 1999
    Assignee: Prescolite-Moldcast Lighting Company
    Inventors: Wai-Lam Chu, Chris Latsis