Method and apparatus for maintaining a pressure within a product dispenser
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United States of America Patent
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-
Jul 30, 1991
Grant Date -
N/A
app pub date -
Jan 26, 1990
filing date -
Jan 26, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus reestablishes an initial dispensing pressure after each spray down or dispensing of product. A hollow member contains a gas and a liquid reactant. The member has a walled portion with a gas permeable opening. At a pressure equilibrium, where the pressure inside the member equals that outside of the member, substantially no gas or liquid passes in or out of the member through the opening. When product is dispensed the pressure outside of the tube decreases. With this pressure differential the gas in the member forces the liquid reactant out of the tube and into the surrounding environment. A second reactant, disposed outside of the member, mixes with the first reactant to regenerate a pressure outside of the tube, thereby reestablishing an initial dispensing pressure.
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