Patents by Inventor Tanh Q. Van

Tanh Q. Van 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 establishing voice and tone signalling communication in a trunked system
    Patent number: 5203011
    Abstract: A communication system (100) is provided comprising a communication resource controller (110) wherein the likelihood of success for establishing synchronous digital communication with a communication unit (120) is substantially greater than the likelihood of success for establishing analog communication. The communication unit may establish analog communication after the communication resource controller receives a digital access code from the communication unit. The analog communication is deferred until the received signal strength from the communication resource controller is above a predetermined level which makes the establishment of analog communication substantially likely.
    Type: Grant
    Filed: September 4, 1990
    Date of Patent: April 13, 1993
    Assignee: Motorola, Inc.
    Inventors: Ronald L. Bane, Tanh Q. Van