Ammunition and explosives – Gas or mist dispersing – Grenade
Reexamination Certificate
2000-08-29
2002-02-26
Poon, Peter M. (Department: 3644)
Ammunition and explosives
Gas or mist dispersing
Grenade
C102S482000
Reexamination Certificate
active
06349650
ABSTRACT:
The present invention relates generally to tear gas grenades and, more particularly, tear gas-type grenades using as the expulsive force compressed gas such as CO
2
which, unlike a pyrotechnic, is flameless and thus provides a correspondingly flameless use.
BACKGROUND OF THE INVENTION
Field of the Invention
The use of expulsive Carbon Dioxide (CO
2
) tear gas grenades are well known because the expulsion is flameless due to the use of CO
2
, as distinguished from a pyrotechnic expulsive fuel which burns hot and may shoot out white hot slag, one such flameless CO
2
tear gas grenade being that described and illustrated in U.S. Pat. No 5,069,134 for “Flameless Expulsive Grenade” issued to Pinkney on Dec. 3, 1991.
The '134 tear gas grenade and all other known similar grenades benefit from a flameless expulsion due to the use of CO
2
for the tear gas formulation which is normally in powder or liquid form, but in the absence of delicate handling prior to use and/or careful control during use, these grenades are vulnerable to premature release of the CO
2
and thus a tear gas consequence at an unwanted non-target area location.
SUMMARY OF THE INVENTION
Broadly, it is an object of the present invention to provide a flameless CO
2
tear gas grenade overcoming the foregoing and other shortcomings of the prior art.
More particularly, it is an object to release the CO
2
for its expulsive effect following a piercing of its storage container caused by use of an expanding and contracting pyrotechnic-produced gas, but under safe and controlled circumstances which maintains its flameless nature, and in which the gas expansion for container piercing and subsequently contraction for CO
2
release from the pierced container entails a time interval which obviates any premature tear gas consequence until completion of the trajectory of the grenade at the target area, all as will be better understood as the description proceeds.
REFERENCES:
patent: 3188954 (1965-06-01), Roach et al.
patent: 3795197 (1974-03-01), Levenson
patent: 4932328 (1990-06-01), Pinkney et al.
patent: 5069134 (1991-12-01), Pinkney
patent: 6250226 (2001-06-01), Leichter et al.
Brunn Michael
Kravel Jacob
Myron Amer P.C.
Poon Peter M.
Smith Kimberly S.
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