Patent ID: 7712683

Claim:
A cartridge for use with a liquid diffusing device, the diffusing device including a source of compressed gas, the cartridge comprising: a reservoir and a diffusion head mounted to the reservoir; the reservoir defining an interior space partially filled with a liquid to be diffused and a head space above the liquid within the reservoir; the diffusion head comprising: a venturi having a narrow end and an opposing wide end, the wide end opening into an initial expansion chamber, the expansion chamber having a plurality of openings into the head space, the narrow end including only a first opening and a second opening; a conduit including a first end extending below the liquid level in the reservoir, a second end of the conduit in fluid communication with the first opening of the narrow end and fixed in position with respect to the narrow end; an inlet in fluid communication with the second opening of the narrow end of the venturi and permitting gas to flow from the source of compressed gas of the diffusing device into the venturi; an outlet in fluid communication with the head space permitting gas within the head space to exit the cartridge, the outlet including a second chamber through which the gas within the head space must pass to exit the cartridge, the second chamber including a liquid return opening permitting liquid accumulating within the secondary chamber to return the reservoir.