Patents by Inventor Derrick Perkins, Jr.

Derrick Perkins, Jr. 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).

  • Archery broadhead having blade cut-out and method for making same
    Patent number: 7951023
    Abstract: A broadhead comprising a ferrule configured to be mounted on an arrow shaft, and at least two cutting blades, configured to be mounted on the ferrule, each having a penetration limiter formed therein. The at least two cutting blades each have a cutting edge and a cutting tip, and wherein the penetration limiter comprises a cut-out formed in the cutting edge to limit penetration of the broadhead upon impact.
    Type: Grant
    Filed: November 8, 2007
    Date of Patent: May 31, 2011
    Assignee: Liberty Research Co.
    Inventor: Derrick Perkins, Jr.
  • Apparatus for machining a workpiece
    Patent number: 6249944
    Abstract: A multi-head machine tool for machining a workpiece into an article has a head that holds a workpiece and that rotates the workpiece. A multi-head tool attachment is capable of machining a plurality of working sites on the workpiece during rotation of the workpiece simultaneously.
    Type: Grant
    Filed: April 3, 2000
    Date of Patent: June 26, 2001
    Inventor: Derrick Perkins, Jr.
  • Method and apparatus for machining a workpiece
    Patent number: 6049965
    Abstract: A multi-head machine tool for machining a workpiece into an article has a head that holds a workpiece and that rotates the workpiece. A multi-head tool attachment is capable of machining a plurality of working sites on the workpiece during rotation of the workpiece simultaneously.
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: April 18, 2000
    Assignee: Liberty Research Company, Inc.
    Inventor: Derrick Perkins, Jr.