Patent ID: 9636431
Date: 2017-05-02
CPC Classifications: A61L,B05B

Claim:
1. A dispensing apparatus, comprising; a reservoir containing a fluid to be dispensed in an aerosol form; an outlet at a base portion of the reservoir, leading along a conduit to a dispensing port at an end of the conduit; the dispensing port comprising a piezo element which is porous, thereby to permit dispensing from a front side of the element, of fluid contacting the element on a rear side, which is located over the end of the conduit and closes the end of the conduit, and which is drivable to vibrate and thereby dispense fluid from the dispensing port, in use the arrangement being to allow fluid to flow by gravity from the reservoir through the conduit to the piezo element; a bleed tube communicating at one end with the conduit, between the outlet and the closed end, and extending generally vertically from the conduit to a location above the dispensing port, and including a selectively closeable valve; and a source of below-atmospheric pressure to the portion of the reservoir above the fluid.