Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Projectile backstop
Reexamination Certificate
2007-07-17
2007-07-17
Graham, Mark S. (Department: 3711)
Amusement devices: games
Aerial projectile game; game element or accessory therefor...
Projectile backstop
Reexamination Certificate
active
11484558
ABSTRACT:
A method providing a self-dispensing additive for buffering a projectile trapping medium and passivating spent projectiles trapped therein. The additive is a buffering compound formed as blocks of low-density foamed-concrete that self-dispenses the additive when contacted by the fired projectiles. The blocks contain dry components that may include one or more of low-solubility phosphate compounds, low-solubility aluminum compounds, iron compounds, sulfate compounds, and calcium carbonate mixed with a cementing material, water, and an aqueous-based foam in substantially stoichiometric amounts. The aqueous-based foam is added in a quantity sufficient to adjust the density of the block to neutral buoyancy in the projectile-trapping medium. The additive chemically stabilizes the medium while also passivating projectiles, in particular heavy-metal projectiles, trapped in the medium.
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Fransen Edward J.
Larson Steven L.
Malone Philip G.
Tom Joe G.
Weiss, Jr. Charles A.
Baugher, Jr. Earl H
Graham Mark S.
The United States of America as represented by the Secretary of
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