Patents by Inventor Tai Leong Cheng

Tai Leong Cheng 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).

  • Fault detection for traffic light systems using electronic lighting elements
    Patent number: 6583731
    Abstract: An indicator controller (18), an optical assembly (10) having the indicator controller (10), a traffic light system that comprises at least one of the optical assembly (10) and a method for fault indication by the indicator controller (10) is disclosed. A control signal from a control signal generator (20) of the indicator controller (18) is disabled to block off current supply to a diode chain of three light emitting diodes (LEDs) of an array (12) of LEDs. Input to the control signal generator (20) has a frequency setting section that sets the control signal at a predetermined frequency. Consequently, the three LEDs are made to blink according to the predetermined frequency. The control signal is generated when the amplitude of current supply to the array (12) exceeds a threshold setting.
    Type: Grant
    Filed: April 19, 2001
    Date of Patent: June 24, 2003
    Assignee: Singapore Technologies Electronics Ltd.
    Inventors: Hua Tek Chan, Tai Leong Cheng, Muthuraman Ramaswamy
  • Fault detection for traffic light systems using electronic lighting elements
    Publication number: 20020154031
    Abstract: An indicator controller (18), an optical assembly (10) having the indicator controller (10), a traffic light system that comprises at least one of the optical assembly (10) and a method for fault indication by the indicator controller (10) is disclosed. A control signal from a control signal generator (20) of the indicator controller (18) is disabled to block off current supply to a diode chain of three light emitting diodes (LEDs) of an array (12) of LEDs. Input to the control signal generator (20) has a frequency setting section that sets the control signal at a predetermined frequency. Consequently, the three LEDs are made to blink according to the predetermined frequency. The control signal is generated when the amplitude of current supply to the array (12) exceeds a threshold setting.
    Type: Application
    Filed: April 19, 2001
    Publication date: October 24, 2002
    Inventors: Hua Tek Chan, Tai Leong Cheng, Muthuraman Ramaswamy