Over temperature alarm indication apparatus

Details Over temperature alarm indication apparatus Over temperature alarm indication apparatus

2006-03-13

2009-12-08

Smith, R. A. (Department: 2841)

Signals and indicators

Indicators

Temperature responsive or compensating means

C374S106000, C374S162000

Reexamination Certificate

active

07628117

ABSTRACT:
The present invention relates to an over temperature alarm indication apparatus. In order to solve the problem of high cost in the prior art, the apparatus in the present invention comprises a first sealed and transparent container with fixed cubage and a second sealed and transparent container with variable cubage. Said first container and second container are connected through a thin tube, and a certain amount of liquid is filled in said thin tube; alarm indication material for generating color changing effects upon receiving liquid from said thin tube is provided in said first and second container; wherein the change of the environment temperature will cause the air in said first and second container to expand and shrink, and thus move said liquid in said tube. Therefore, said liquid outflows to the alarm indication material in the first container when the environment temperature reaches a lower threshold, and/or said liquid outflows to the alarm indication material in the second container when the environment temperature reaches an upper threshold.

REFERENCES:
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patent: 4457253 (1984-07-01), Manske
patent: 5215378 (1993-06-01), Manske
patent: 7415939 (2008-08-01), Dip
patent: WO 9119174 (1991-12-01), None
patent: WO 2007104180 (2007-09-01), None

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