Condition change indicator

Details Condition change indicator Condition change indicator

1975-10-09

1977-08-02

Swisher, S. Clement

Signals and indicators

Alarms

Fluid flow

73358, G01K 1106, G01K 1108

Patent

active

040389367

ABSTRACT:
Two communicating chambers hold distinctively different materials or substances. An arming device separates them till ready for use. After arming, either the frozen state of the fluid in the lower chamber, or an unmelted plug between the chambers prevents the mixing of the substances until the temperature change to be indicated has taken place.

REFERENCES:
patent: 307220 (1884-10-01), Peters
patent: 577924 (1897-03-01), Libbey
patent: 3665770 (1972-05-01), Sagi
patent: 3677088 (1972-07-01), Lang
patent: 3712141 (1973-01-01), Chadha

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