Patents by Inventor Anthony Kok-Fai Chan

Anthony Kok-Fai Chan 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: 7789052
    Abstract: A variable valve actuator for a power system is provided. The variable valve actuator may have a hydraulic piston extendable to interrupt cyclical movement of an engine valve. The variable valve actuator may also have a pin member pivotally received by the hydraulic piston, and a retaining ring configured to axially align the pin member with the hydraulic piston as the hydraulic piston is retracted.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: September 7, 2010
    Assignee: Caterpillar Inc.
    Inventors: Mark Steven Ellison, Anthony Kok-Fai Chan, John Henry Nguyen, John Stephen Pipis, Jr.
  • Publication number: 20090000581
    Abstract: A variable valve actuator for a power system is provided. The variable valve actuator may have a hydraulic piston extendable to interrupt cyclical movement of an engine valve. The variable valve actuator may also have a pin member pivotally received by the hydraulic piston, and a retaining ring configured to axially align the pin member with the hydraulic piston as the hydraulic piston is retracted.
    Type: Application
    Filed: June 29, 2007
    Publication date: January 1, 2009
    Inventors: Mark Steven Ellison, Anthony Kok-Fai Chan, John Henry Nguyen, John Stephen Pipis, JR.
  • Patent number: 6935323
    Abstract: A system for firing a spark plug is disclosed. The system includes a timing controller configured to send a first timing signal and a second timing signal. The system also includes an ignition transformer having a primary winding and a secondary winding and a spark-plug that is operably associated with the secondary winding. A first switching element is disposed between the timing controller and the primary winding of the ignition transformer. The first switching element controls a supply of power to the primary winding based on the first timing signal. Also, a second switching element is disposed between the timing controller and the primary winding of the ignition transformer. The second switching element controls the supply of power to the primary winding based on the second timing signal. A method for firing a spark plug is also disclosed.
    Type: Grant
    Filed: July 1, 2003
    Date of Patent: August 30, 2005
    Assignee: Caterpillar Inc
    Inventors: Stephen Howard Waters, Anthony Kok-Fai Chan