Method of announcing low level of remaining liquid in dropper

Details Method of announcing low level of remaining liquid in dropper Method of announcing low level of remaining liquid in dropper

1991-01-03

1992-09-22

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324660, 324689, 73304C, 340620, G08B 2100, G01F 2300

Patent

active

RE0340731

ABSTRACT:
This invention relates to a method of annoucing a low level of the remaining liquid in a dropper. According to the present invention, two electrodes are attached to the outer surface of a dropper, and a pulse of a stable level is applied to one of these electrodes. The remaining quantity of the liquid in the dropper can be detected automatically with ease by utilizing the variations of the electrostatic capacity occurring between these two electrodes. An annunciator is activated when it receives a signal representative of a low level of the liquid in the dropper, to inform a nurse of the necessity of replacing the dropper.

REFERENCES:
patent: 3631437 (1971-12-01), Campbell
patent: 3939360 (1976-02-01), Jackson
patent: 4002996 (1977-01-01), Klebanoff
patent: 4083038 (1978-04-01), Klebanoff
patent: 4099167 (1978-07-01), Pomerantz

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