Liquid level indicators

Measuring and testing – Liquid level or depth gauge – Thermal type

Reexamination Certificate

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Reexamination Certificate

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10800149

ABSTRACT:
A liquid level indicator, suitable for determining the level of a volatile liquid within a container, includes temperature sensors spaced vertically apart from each other. A processor processes the outputs of the temperature sensors and produces an indication, such as an audible indication by an audible alert device, when liquid level is detected. The determination of liquid level can be by one or more of various temperature processing techniques, including difference in temperature between temperature sensors, and/or difference in temperature over time at one or more of the temperature sensors.

REFERENCES:
patent: 4672842 (1987-06-01), Hasselmann
patent: 4761638 (1988-08-01), Lozano, Jr.
patent: 2002/0011105 (2002-01-01), Snelling et al.
patent: 686 778 (1940-01-01), None
patent: 36 32 855 (1988-03-01), None
patent: 40 11 639 (1991-10-01), None
patent: 2 277 592 (1994-11-01), None
patent: 97/19328 (1997-05-01), None
Patent Abstracts of Japan. vol. 0181, No. 59. Mar. 16, 1994. JP 5332808.

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