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Abstract

A liquid level detecting device having an overflow reservoir, a flow restriction means and a level detecting means. The reservoir defines a cavity for collecting an electrically-conductive liquid overflowing from a container. This reservoir, which has a low level position associated therewith, includes inlet means through which the overflowing liquid enters, outlet means through which the collected liquid exits, and vent means through which built-up gases escape. Flow restriction means controls the rate at which the collected liquid exits through the reservoir's outlet means. Flow restriction means is calibrated such that the rate at which liquid exits the reservoir does not exceed the rate at which liquid overflows therein. In one embodiment, level detecting means includes a capacitive sensor switch which is fixedly secured to the reservoir to detect whether the liquid level is below the reservoir's low level position. In another embodiment, level detecting means includes a positive and a negative electrical probe attached to, and/or associated with, the reservoir. The positive and negative probes are electrically insulated from one another, in electrical communication with the reservoir's cavity, and positioned to detect whether the liquid level is below the reservoir's low liquid level position. In still another embodiment, an electrical probe is arranged to be in contact with ink overflowing from a second reservoir. This overflow condition is indicative that a normal flow of ink exists within the system.

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First Claim