Patents Assigned to GSA Systems
  • Method and apparatus for preventing recognition of a telephone dialing signal
    Patent number: 4924512
    Abstract: A method and apparatus for preventing recognition by a telephone system of a telephone dialing signal which inverts at least a portion of the telephone dialing signal in response to receiving the telephone dialing signal. Consequently, an inverted dialing signal is produced and is combined with the telephone dialing signal. Voice and data signals are unaffected. The telephone dialing signal is then connected to the telephone system and is unrecognizable as a valid number.
    Type: Grant
    Filed: January 6, 1989
    Date of Patent: May 8, 1990
    Assignee: GSA Systems
    Inventors: Norman Sizemore, Rudolf Gerritsen