Patents by Inventor Joseph D. G. Houle

Joseph D. G. Houle 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).

  • Automatic positive telephone disconnect system
    Patent number: 4949375
    Abstract: The invention represents an automatic positive disconnect circuit for controlling the connection of a communication device having two signal conducting lines and sensing means for indicating the mode of said communication device. The circuit is designed to positively disconnect the first and second lines of the communication device when the latter is in the non-operating mode, to filter selected frequencies when in the operating mode, and to permit said communication device to otherwise operate in a normal manner whenever a call is received or a call is initiated.
    Type: Grant
    Filed: April 13, 1989
    Date of Patent: August 14, 1990
    Inventor: Joseph D. G. Houle