Patents by Inventor Robert J. Hurle

Robert J. Hurle 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).

  • Telephone set with loop current interruption timing control
    Patent number: 4086440
    Abstract: In a telephone set, possible mistakes in the generation of "hook flash" and "disconnect" signals, as customarily produced by operation of the hook switch and manifested as interruptions in the loop current, are avoided by a signal generating circuit which produces an accurately timed interruption of loop current, as a hook flash signal, in response to operation of a hook flash push button and which also produces another accurately timed and substantially longer interruption of loop current, as a disconnect signal, in response to operation of the hook switch.
    Type: Grant
    Filed: April 12, 1977
    Date of Patent: April 25, 1978
    Assignee: Chestel, Inc.
    Inventor: Robert J. Hurle