Patents by Inventor Phat T. Le

Phat T. Le 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).

  • Method and apparatus for controlling parallel port drivers in a data processing system
    Patent number: 5553306
    Abstract: A parallel port interface for utilization between a first device and a second device designated by a user for transmitting a digital signal from the device to the second device. The parallel port interface includes a switchable driver circuit for transmitting the digital signal, which includes a first circuit for emulating an open collector circuit and a second circuit for emulating a totem pole circuit. The switchable driver circuit is controlled by a logic control circuit that automatically selects either the first circuit or the second circuit for transmitting the digital signal in response to the digital signal and a designation of the second device.
    Type: Grant
    Filed: September 7, 1994
    Date of Patent: September 3, 1996
    Assignee: International Business Machines Corporation
    Inventors: Margaret Claffey-Cohen, Phat T. Le, Timothy J. Louie, Alan F. Neel, II, James P. Ward