| 摘要 |
<p>A liquid dispenser (25) having a replaceable unvented liquid container ( 90 ) with only an outlet opening (113), a discharge assembly (120) in liquid communication with the liquid container outlet opening, and including a compressible nipple (121) for accommodating a charge of liquid, a check valve (140) for regulating the flow of liquid into the nipple and a semipermeable filter (142) mounted in and substantially filling the inlet (133) to the check valve, the filter element being permeable to air to introduce air into the liquid container through its outlet opening, the filter element being impermeable to liquid to prevent back flow of liquid through the air passageway, and having an opening (146) therethrough which is aligned with the inlet of the check valve, defining a liquid passageway through the filter element to the check valve. The liquid dispenser includes an anti-bootleg structure including a plate (160) mounted on the dispenser and having an irregularly shaped opening (113) which permits installation on the dispenser of only such cartridges that have a correspondingly shaped neck portion, thereby preventing the use of unauthorized cartridges. <IMAGE></p> |
