Patents by Inventor Francis W. Campbell

Francis W. Campbell 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).

  • Drumstick balanced for juggling
    Patent number: 5218152
    Abstract: In a first embodiment, a drumstick, balanced for juggling, exhibits a center of mass in the range of 58% to 62% of the distance along its length from the butt end. It is herein recognized that such a drumstick is suitable for both juggling and drumming, and supports a drumming performance which includes a juggling portion. In second and third embodiments, a drum mallet and a keyboard mallet, each of which is balanced for juggling, exhibits a center of mass in the range of 58% to 62% along the shaft from the butt end.
    Type: Grant
    Filed: June 12, 1991
    Date of Patent: June 8, 1993
    Inventors: Francis W. Campbell, William R. Sands, III