Patents by Inventor Doan N. Huan

Doan N. Huan 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).

  • Security system using call display
    Patent number: 5511109
    Abstract: An improved alarm security system is disclosed which provides caller identification information when an alarm panel completes a telephone communication with a central computer. Such information is automatically provided by the telephone network upon initiation of a telephone communication. The central computer can use this information alone or in combination with other information received from the alarm panel to improve reliability and provide a more effective security system.
    Type: Grant
    Filed: October 1, 1993
    Date of Patent: April 23, 1996
    Assignee: Sur-Gard Security Systems Ltd.
    Inventors: Douglas Hartley, Doan N. Huan, Sean Bailey