Patents by Inventor Wai-Shing P. Ko

Wai-Shing P. Ko 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).

  • Two-level security lighting system
    Patent number: 5747937
    Abstract: A security light has a quartz-halogen lamp, a photocell, a passive infrared sensor for detecting motion external to the security light, and a circuit which causes the quartz-halogen lamp to operate at about 50% of full brightness in the absence of detection of motion at night, to operate at 95% of full brightness for a predetermined time interval in response to detection of motion at night, and to be off while the photocell is detecting daylight. A switch allows the user to select a different mode of operation which is similar except that the lamp is kept off in the absence of detection of motion at night. A user-initiated override mode is also provided, which causes the lamp to continuously operate at 95% of full brightness until the photocell detects daylight or until the user disables the override mode.
    Type: Grant
    Filed: October 30, 1996
    Date of Patent: May 5, 1998
    Assignee: Heath Company, Inc.
    Inventors: David L. Wiesemann, Daniel E. Schaaf, Wai-Shing P. Ko
  • Two-level security lighting system
    Patent number: 5598066
    Abstract: A security light has a quartz-halogen lamp, a photocell, a passive infrared sensor for detecting motion external to the security light, and a circuit which causes the quartz-halogen lamp to operate at about 50% of full brightness in the absence of detection of motion at night, to operate at 95% of full brightness for a predetermined time interval in response to detection of motion at night, and to be off while the photocell is detecting daylight. A switch allows the user to select a different mode of operation which is similar except that the lamp is kept off in the absence of detection of motion at night. A user-initiated override mode is also provided, which causes the lamp to continuously operate at 95% of full brightness until the photocell detects daylight or until the user disables the override mode.
    Type: Grant
    Filed: February 13, 1996
    Date of Patent: January 28, 1997
    Assignee: Heath Company
    Inventors: David L. Wiesemann, Daniel E. Schaaf, Wai-Shing P. Ko