Patents by Inventor William F. Sparks

William F. Sparks 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).

  • Safety guard for the blade of carton openers
    Patent number: 4086698
    Abstract: A blade guard is mounted to a conventional carton cutter for longitudinal, reciprocal movement between a "safe" position outwardly of and covering the tip of the cutter blade and a retracted position spaced inwardly from and exposing the tip and a portion of the blade. The guard is normally spring biased to the safe position, yet responsive to pressure against the carton wall to retract the guard until it passes the end of the carton wall in front of the blade.
    Type: Grant
    Filed: February 28, 1977
    Date of Patent: May 2, 1978
    Assignee: Macfield Texturing, Inc.
    Inventor: William F. Sparks