Patents by Inventor John E. A. Powers

John E. A. Powers 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: 4649890
    Abstract: A compound bow that uses mechanical advantage for interconnecting the bowstring with the resilient bow limbs is configured in such a way that all components of the mechanical advantage are positioned to lie outside the immediate vicinity of the arrow position, thereby permitting the bowstring to be aligned with the centerline of the limbs and further permitting all vector forces operating on the bowstring, limbs, and mechanical advantage to lie in a common plane, thus minimizing twisting torques applied to the limbs. In an embodiment comprising cables attached to cams as part of the mechanical advantage, the use of rotating cable-end fasteners minimizes the friction from cable flexing.
    Type: Grant
    Filed: June 8, 1984
    Date of Patent: March 17, 1987
    Inventor: John E. A. Powers