Patents by Inventor Robert L. Blackstone

Robert L. Blackstone 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: 4207858
    Abstract: A compound bow having a handle and flexing limbs extending outwardly from the handle. A bracket is carried adjacent a medial portion of the handle and a pair of arms are pivotally secured thereto. The arms diverge rearwardly from the bracket. A string engaging member is carried adjacent the outer ends of each of the arms. A pair of pulleys are carried adjacent each remote end of the limbs. A bow string has opposed ends thereof attached to a respective inner end of a respective arm. The string extends around the pulleys on the ends of the limbs and the string engaging members so that when a notching portion of the string is drawn for shooting an arrow, the pivotal arms are pivoted from an open extended position to a partially closed position providing a uniform draw of the string when drawing the string from a released position to a fully drawn position. A pair of eccentric cams are carried adjacent the arms over which respective opposed end portions of the string extends.
    Type: Grant
    Filed: April 4, 1978
    Date of Patent: June 17, 1980
    Inventor: Robert L. Blackstone