Patents by Inventor Fred E. Mannila

Fred E. Mannila 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).

  • Stereophonic sound adaptor for simulating sound movement
    Patent number: 4048442
    Abstract: A stereophonic sound adaptor for producing the illusion of moving sound is disclosed. The device includes a plurality of output speakers in conjunction with a stereo amp output and an electro-mechanical transfer station. Through the electro-mechanical transfer station, signals from the stereo amp output are sequentially switched to various combinations of speakers so as to produce the illusion of sound movement in a room.
    Type: Grant
    Filed: May 22, 1975
    Date of Patent: September 13, 1977
    Inventors: Richard S. Mannila, Fred E. Mannila, Donald A. Mannila