Dipstick for liquid nitrogen

Details Dipstick for liquid nitrogen Dipstick for liquid nitrogen

1978-12-20

1980-07-29

Phillips, Charles E.

Geometrical instruments

Area integrators

Electrical

33493, 33494, 62 49, G01F 2304

Patent

active

042143683

ABSTRACT:
A method for measuring with a flexible dipstick the nonvisible level of liquid nitrogen in a container. The dipstick, made of a solid plastic strip having a flat cross-section and a dark color on which is printed a visible scale, is inserted into the liquid nitrogen-containing container for a short time. The dipstick is then rapidly waved in the air to permit frost to form on the cold portion that was immersed in the liquid nitrogen. The dipstick has a relatively high width-to-thickness ratio to provide waveability and flexibility for quickly forming the frost line and for permitting compact storage when not in use.

REFERENCES:
patent: 2171504 (1939-08-01), Keuffel et al.
patent: 2622330 (1952-12-01), Neiman
patent: 3006314 (1961-10-01), Malec
patent: 3031887 (1962-05-01), Weisend

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