Patents by Inventor Kung-hsung Liu

Kung-hsung Liu 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).

  • Communication controlling apparatus for a single-line telephone with extensions thereto
    Patent number: 5566233
    Abstract: In a single-line telephone, there are a plurality of extension telephone sets connected by a telephone line and each extension telephone set is connected to a communication controlling apparatus. The communication controlling apparatus includes an alternating current coupler and a power supply thus allowing two extension telephone sets to communicate with each other without being disturbed by a busy tone.
    Type: Grant
    Filed: April 21, 1995
    Date of Patent: October 15, 1996
    Inventor: Kung-hsung Liu