Patents by Inventor Philip F. Schweitzer

Philip F. Schweitzer 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).

  • Patent number: 4284851
    Abstract: A method and arrangement for frustrating attempted fraudulent calls from a station using a "blue box" device to avoid toll charges. Upon detecting a possible fraudulent call, the sequence of digits from the blue box is altered to divert the call from its intended destination. Specifically, "KEY PULSE" and "START PULSE" tones are generated and commingled with the digits from the blue box to route the call to reorder.
    Type: Grant
    Filed: June 29, 1979
    Date of Patent: August 18, 1981
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Philip F. Schweitzer, John R. Shine