Patents by Inventor Lake Lau

Lake Lau 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).

  • Ballast circuit for high intensity discharge lamps
    Patent number: 6181084
    Abstract: A ballast circuit for a high intensity discharge lamp includes a boost converter, responsive to a dc input voltage, for providing a boosted dc output voltage; a boost controller, responsive to the boosted dc output voltage, for driving the boost converter to maintain the boosted output voltage at a predetermined level; a buck converter, responsive to the boosted dc output voltage, for providing a reduced dc output voltage; and a buck controller, responsive to the reduced output voltage, for driving the buck converter to operate the discharge lamp in a transition mode and maintaining the reduced dc output voltage at a preselected level for operating the discharge lamp in a steady state mode.
    Type: Grant
    Filed: February 25, 1999
    Date of Patent: January 30, 2001
    Assignee: EG&G, Inc.
    Inventor: Lake Lau
  • Electronic ballast circuit for a fluorescent light
    Patent number: 5444333
    Abstract: An energy efficient and cost effective electronic ballast circuit which lights a fluorescent tube but which avoids excessive voltages or pulsing of the tube. The starter circuit preheats the filaments for a time sufficient to ensure quick ignition upon application of an appropriate voltage, then ceases the flow of current after the tube is lighted to avoid wasting energy.
    Type: Grant
    Filed: May 26, 1993
    Date of Patent: August 22, 1995
    Assignee: Lights Of America, Inc.
    Inventor: Lake Lau