Patents by Inventor Don Chang

Don Chang 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).

  • Logic circuit using hardware to process keyboard scanning
    Patent number: 6980135
    Abstract: A logic circuit uses hardware to process keyboard scanning, more especially, a microprocessing system inputs the signal through a pressed key into a control circuit for conducting operation; since the column input end has electric resistance with higher driving ability than that of the row output/input end, a higher electric potential status is thereby obtained and conducted with the circuit through a pressed key to make the high and the lower electric potentials approach in accordance with each other and generate electric potential change, or through a converting method of automatically driving electric potential, the innovative effect of the present invention is achieved.
    Type: Grant
    Filed: January 11, 2002
    Date of Patent: December 27, 2005
    Assignee: Alcor Micro, Corp.
    Inventors: Chi-Tung Chang, Don Chang
  • Logic Circuit using hardware to process keyboard scanning
    Publication number: 20030132864
    Abstract: A logic circuit uses hardware to process keyboard scanning, more especially, a microprocessing system inputs the signal through a pressed key into a control circuit for conducting operation; since the column input end has electric resistance with higher driving ability than that of the row output/input end, a higher electric potential status is thereby obtained and conducted with the circuit through a pressed key to make the high and the lower electric potentials approach in accordance with each other and generate electric potential change, or through a converting method of automatically driving electric potential, the innovative effect of the present invention is achieved.
    Type: Application
    Filed: January 11, 2002
    Publication date: July 17, 2003
    Inventors: Chi-Tung Chang, Don Chang