Patents by Inventor Derrick Perkins

Derrick Perkins 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.
  • Archery broadhead with replaceable blades
    Patent number: 7410434
    Abstract: A broadhead includes a ferrule for mounting an arrowshaft, the ferrule having a locking portion. At least two blades are mounted on the ferrule (three are used in the preferred embodiment), the blades being coupled to the ferrule in their center portions by notches that mate with the locking portion of the ferrule. A locking nut is mounted on a rear portion of the ferrule for holding the three blades in place on the ferrule when the locking nut is tightened.
    Type: Grant
    Filed: January 31, 2005
    Date of Patent: August 12, 2008
    Assignee: Liberty Research Co.
    Inventor: Derrick Perkins, Sr.
  • Archery broadhead with replaceable blades
    Publication number: 20050288135
    Abstract: A broadhead includes a ferrule for mounting an arrowshaft, the ferrule having a locking portion. At least two blades are mounted on the ferrule (three are used in the preferred embodiment), the blades being coupled to the ferrule in their center portions by notches that mate with the locking portion of the ferrule. A locking nut is mounted on a rear portion of the ferrule for holding the three blades in place on the ferrule when the locking nut is tightened.
    Type: Application
    Filed: January 31, 2005
    Publication date: December 29, 2005
    Applicant: Liberty Research Co.
    Inventor: Derrick Perkins
  • Archery broadhead with replaceable blades
    Patent number: 6875138
    Abstract: A broadhead includes a ferrule for mounting an arrowshaft, the ferrule having a locking portion. At least two blades are mounted on the ferrule (three are used in the preferred embodiment), the blades being coupled to the ferrule in their center portions by notches that mate with the locking portion of the ferrule. A locking nut is mounted on a rear portion of the ferrule for holding the three blades in place on the ferrule when the locking nut is tightened.
    Type: Grant
    Filed: October 24, 2003
    Date of Patent: April 5, 2005
    Assignee: Liberty Research Co.
    Inventor: Derrick Perkins, Sr.
  • Archery broadhead with replaceable blades
    Publication number: 20040092342
    Abstract: A broadhead includes a ferrule for mounting an arrowshaft, the ferrule having a locking portion. At least two blades are mounted on the ferrule (three are used in the preferred embodiment), the blades being coupled to the ferrule in their center portions by notches that mate with the locking portion of the ferrule. A locking nut is mounted on a rear portion of the ferrule for holding the three blades in place on the ferrule when the locking nut is tightened.
    Type: Application
    Filed: October 24, 2003
    Publication date: May 13, 2004
    Applicant: Liberty Research Co.
    Inventor: Derrick Perkins
  • 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.