Explosive and thermic compositions or charges – Containing particular fuel and particular oxidizer
Reexamination Certificate
2009-03-04
2011-11-22
McDonough, James (Department: 1731)
Explosive and thermic compositions or charges
Containing particular fuel and particular oxidizer
C149S088000, C149S092000, C149S109400
Reexamination Certificate
active
08062443
ABSTRACT:
Embodiments of the present subject matter provide an improved percussion primer composition and improved hot-wire igniter acceptor, wherein lead styphnate is replaced with a lead-free material, 4,6-dinitro-7-hydroxybenzofuroxan, potassium salt (KDNP). Embodiments of the percussion primer composition include KDNP, a sensitizer, an oxidizer, calcium silicide, a fuel, and a binder. Sensitizers may include tetracene. Oxidizers may include alkali or alkaline earth nitrates, oxides, or peroxides (such as barium nitrate). Fuel materials may include metals, metal sulfides, or other non-metallic materials. Common binders may include nitrocellulose based shellacs, gum arabic/poly vinyl alcohol mixtures, and guar gum/poly vinyl alcohol mixtures. Embodiments of the hot-wire igniter device include a bridgewire, an acceptor, and an output, where KDNP is the acceptor. Power supply may be in the form of constant current/voltage or current flow from a capacitor discharge. Certain embodiments utilize a variety of output formulations, such as BKNO3, black powder, and Red Dot double base propellant.
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Bichay Magdy M.
Fronabarger John W.
Williams Michael D.
Kilpatrick Townsend & Stockton LLP
McDonough James
Pacific Scientific Energetic Materials Company
The United States of America as represented by the Secretary of
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