Patents by Inventor Randall A. Forselius

Randall A. Forselius 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).

  • Multi-tone whistle
    Patent number: 5113784
    Abstract: A simple toy whistle includes a mouthpiece and multiple resonant chambers. In order to permit single notes to be played by one resonant chamber, while preventing the other chambers from producing audible tones when the whistle is played, each such chamber is provided an additional opening. This opening is provided with an annular boss so that it can be sealed by the pad of the user's thumb or finger when the corresponding chamber is to resonate.
    Type: Grant
    Filed: December 7, 1990
    Date of Patent: May 19, 1992
    Inventor: Randall A. Forselius