Patents by Inventor Hang-Shang Liang

Hang-Shang Liang 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).

  • Dynamic printer-port switcher for selectively connecting at least two peripheral devices to a PC having a printer port
    Patent number: 5928341
    Abstract: A dynamic printer-port switcher (DPS) is provided for use on a computer system such as a personal computer (PC) for selectively connecting the PC to a number of peripheral devices, such as printers, PC cameras, scanners, external CD-ROM drives, and external hard disk drives, through software control. Broadly, the DPS includes a printer-port connector for connecting the DPS to a printer port on the PC, at least two peripheral de connectors for connecting the DPS to two peripheral devices such as a printer and a PC camera. Further, the DPS includes a first and second switching circuits which are under control by a control circuit to selectively connect the PC to one of the connected peripheral devices.
    Type: Grant
    Filed: September 4, 1997
    Date of Patent: July 27, 1999
    Inventor: Hang-Shang Liang