Patents by Inventor John P. Fairbanks, Sr.

John P. Fairbanks, Sr. 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).

  • Line-powered detection of call progress tones
    Patent number: 5790653
    Abstract: The invention provides a method for detecting a call progress tone on a pair of telephone conductors (the telephone line). The level of energy stored in an energy storage device is continually checked. When the level of energy of the energy storage device is below a threshold, the system couples the telephone line to an off-hook impedance. While coupled to the telephone line, the system charges the energy storage device using current drawn from the telephone line, and the system detects the presence of the call progress tone on the telephone line.
    Type: Grant
    Filed: January 16, 1997
    Date of Patent: August 4, 1998
    Assignee: VoiceWaves, Inc.
    Inventors: John P. Fairbanks, Sr., Scott M. Fairbanks