US 7,571,912 B2
Bullet trapping medium, system for employing said medium and method of use of said medium
Steven L. Larson, Vicksburg, Miss. (US); Charles A. Weiss, Clinton, Miss. (US); Joe G. Tom, Vicksburg, Miss. (US); Philip G. Malone, Vicksburg, Miss. (US); and Edward J. Fransen, Irvine, Calif. (US)
Assigned to The United States of America as represented by the Secretary of the Army, Washington, D.C. (US)
Filed on Nov. 03, 2004, as Appl. No. 10/979,834.
Application 10/979834 is a continuation of application No. 10/307427, filed on Dec. 02, 2002, granted, now 6,837,496.
Prior Publication US 2005/0093243 A1, May 05, 2005
This patent is subject to a terminal disclaimer.
Int. Cl. F41J 1/12 (2006.01)
U.S. Cl. 273—410 29 Claims
OG exemplary drawing
 
1. A stable fire retardant mixture for decelerating and trapping projectiles comprising at least in part heavy metals, said mixture at least reducing leaching of said heavy metals, said mixture at least comprising:
a resilient granular material;
a hydrated super absorbent polymer (SAP) gel,
wherein said hydrated SAP gel is intimately mixed with said resilient granular material to yield a first interim mixture, andwherein said hydrated SAP gel adheres to said resilient granular material, resisting removal by either aqueous solutions or abrasion from said projectiles;
at least one first additive,
wherein said first additive chemically stabilizes at least said hydrated SAP gel, andwherein said first additive facilitates maintaining the pH of at least said hydrated SAP gel at above about 4.5, andwherein said first additive forms a passive coating on metallic particles introduced to said stable fire retardant mixture;
at least one second additive,
wherein said second additive at least reduces said leaching of heavy metals, andwherein said first and second additives remain as powdery solids in said stable fire retardant mixture, andwherein at least one of said first and second additives at least prevent the leaching of phosphate, andwherein at least one of said first and second additives retards the growth of mold and bacteria, andwherein said first and second additives are intimately mixed with said first interim mixture to yield said stable fire retardant mixture.