Patents by Inventor Tony T. Tam

Tony T. Tam 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).

  • Apparatus and methods for avoiding loss of closed caption data when using extended data services
    Patent number: 5543852
    Abstract: Apparatus and methods are provided for inserting data into a vertical blanking interval (VBI) line of video frames. The method includes the steps of inserting first data into a first vertical blanking interval VBI line for a plurality of consecutive video frames, inserting second data into a second vertical blanking interval VBI line for a plurality of consecutive video frames, counting a number of consecutive video frames having first data inserted into the first vertical blanking interval VBI line, terminating the insertion of first data for a first number of video frames before again inserting first data into the first vertical blanking VBI interval line when the counted number of consecutive video frames into which first data is inserted into the first vertical blanking interval VBI line equals a second number, and repeating the steps.
    Type: Grant
    Filed: June 24, 1994
    Date of Patent: August 6, 1996
    Assignee: Index Systems, Inc.
    Inventors: Henry C. Yuen, Daniel S. Kwoh, Wing P. Leung, Tony T. Tam