Patents by Inventor Robert Hsue

Robert Hsue 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).

  • Infra-red wireless keyboard system
    Patent number: 5189543
    Abstract: A communication system comprising a wireless keyboard for emitting infra-red signals, a receiving unit for converting the infra-red signals to an electrical signal, a tuning and amplifying circuit coupled to the receiving unit for tuning and amplifying the electrical signals, a carrier filtering circuit for removing the carrier component of the input signal, a single-shot circuit coupled to the carrier filtering circuit for converting its input signal to a known code wave form, and a microprocessor for receiving the code wave. The invention allows multiple users to operate their wireless keyboards without interference.
    Type: Grant
    Filed: November 19, 1990
    Date of Patent: February 23, 1993
    Assignee: Acer Incorporated
    Inventors: Steve Lin, Kent Kao, Robert Hsue