Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1978-03-07
1979-05-15
Swisher, S. Clement
Measuring and testing
Gas analysis
Moisture content or vapor pressure
G01K 1116
Patent
active
041541073
ABSTRACT:
There is provided a time temperature device having an indicator layer which visually indicates the lapse of a time temperature integral. A signaling component is provided which, upon contact with the indicating layer, causes the indicator layer to undergo a visually perceptive change. The device further includes a reservoir for the signaling component, including a first backing and adhesive layer containing an adhesive substance. The adhesive layer is positioned between the indicating layer and the first backing.
REFERENCES:
patent: 3243303 (1966-03-01), Johnson
patent: 3922917 (1975-12-01), Ayres
patent: 4057029 (1977-11-01), Seiter
Giezen Egenius A.
Hoefs Cornelis A. M.
Opschoor Abram
Verhulst Eduard M.
Akzona Incorporated
Carter David M.
Swisher S. Clement
Young Francis W.
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