Liquid nitrogen level indicator

Details Liquid nitrogen level indicator Liquid nitrogen level indicator

1978-10-16

1980-02-12

Petrakes, John

Measuring and testing

Liquid level or depth gauge

Thermal type

G01F 2322

Patent

active

041877233

ABSTRACT:
Sensing elements are located at various required levels in a vacuum dewar. esistance changes are detected external to the container and used to indicate the presence of a liquid at a particular level.

REFERENCES:
patent: 3151468 (1964-10-01), Martin
patent: 3181557 (1965-05-01), Lannan, Jr.
patent: 3267730 (1966-08-01), Satterthwaite et al.
patent: 3371533 (1968-03-01), Dumas
patent: 3435680 (1969-04-01), Holzer
patent: 3496773 (1970-02-01), Cornish
patent: 3500687 (1970-03-01), Smith
patent: 3512412 (1970-05-01), Weining
patent: 3740740 (1973-06-01), Milo
patent: 3914950 (1975-10-01), Fletcher et al.
patent: 3938347 (1976-02-01), Riedel et al.

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