Patents by Inventor David A. Worrell, II

David A. Worrell, II 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).

  • Process for manufacture of perforated slab propellant
    Patent number: 6071444
    Abstract: A method of producing a perforation pattern in a slab of thermoplastic propellant material and the material produced includes subjecting the slab to a perforating press operation in which the press has a patterned array of fixed perforating members arranged according to a first pattern coordinated with a system for advancing and incrementally indexing the slab through the press is used to perforate the slab to create a desired second, denser perforation pattern by subjecting the slab to a series of perforation actions by the patterned array of perforating means coordinated with the indexing of the slab through the press.
    Type: Grant
    Filed: November 24, 1997
    Date of Patent: June 6, 2000
    Assignee: Alliant Techsystems Inc.
    Inventors: William J. Worrell, Jr., David A. Worrell, II, Joseph M. Donckers