Ageing indicator

Details Ageing indicator Ageing indicator

1980-07-28

1983-09-20

Yasich, Daniel M.

Signals and indicators

Indicators

Chemically activated type

116308, 194DIG18, 368 93, 368327, 422 88, G01D 2100, G04F 104

Patent

active

044049226

ABSTRACT:
An ageing indicator compares a closed sachet of one or more closed tubes of a material which is slightly permeable to a fluid contained in the sachet or tube. The rate of permeation of the fluid through the sachet-like assembly tube wall depends upon temperature and time of exposure to that temperature so the quantity of fluid loss is indicative of temperature and time; the ageing capable of then being detected either by measuring a column of the liquid in a tube or by observing the appearance or disappearance of printed indicia in the sachet.

REFERENCES:
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patent: 3981683 (1976-09-01), Larsson
patent: 4038873 (1977-08-01), Kimmel
patent: 4057029 (1977-11-01), Seiter
patent: 4134359 (1979-01-01), Redpath

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