Patents by Inventor Daniel H. Dawdy

Daniel H. Dawdy 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).

  • PBX and adjunct using multi-frequency tones for communication therebetween
    Patent number: 4879743
    Abstract: A PBX system is responsive to an incoming call which is directed to an adjunct of the system for sending a ringing signal over a station facility to the adjunct. When the adjunct goes off-hook, the system outputs to the adjunct over the station facility multi-frequency tones containing information associated with the incoming call prior to establishing a connection between the adjunct and calling party. The information selects the proper operating mode of the adjunct and provides other call processing information to the adjunct. The adjunct communicates information to the PBX using a switch-hook flash and multi-frequency tones.
    Type: Grant
    Filed: October 3, 1988
    Date of Patent: November 7, 1989
    Assignees: American Telephone and Telegraph Company, AT&T Information Systems Inc.
    Inventors: Edmund T. Burke, Daniel H. Dawdy, Timothy M. Rubert