Patents by Inventor Donald I. MacAllister

Donald I. MacAllister 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: 5481599
    Abstract: A circuit for use with or built into a telephone set, that detects and intercepts the telephone company's ring signal, supressing the telephone set's existing ringer, and substituting instead, a user selected audio segment. A choice of audio segments may be made from an internal memory device or as downloaded from a supplier of such audio segments by high-speed modem. A synthesized stereo signal is generated so that an incoming phone call is announced by a high quality, stereo audio signal of ones choice such as the sound of wind, water or trees, animal sounds, music, or other sounds. Usable audio segments may be obtained via a built-in microphone or downloaded at high speed through the use of a built-in modem over phone lines.
    Type: Grant
    Filed: November 15, 1994
    Date of Patent: January 2, 1996
    Inventors: Donald I. MacAllister, Douglas L. Turner