Timer and storage condition indicator

Details Timer and storage condition indicator Timer and storage condition indicator

1979-06-18

1981-10-06

Yasich, Daniel M.

Signals and indicators

Indicators

By touch

73 73, 116207, 116214, 116270, 368 89, 422 56, 426 88, G01K 0102, G04F 0100, G01N 3122

Patent

active

042929164

ABSTRACT:
A disposable timer and product storage condition indicator in which components of a carrier mixture react physically and/or chemically with one or more receptive layers. The carrier mixture and receptive layers are so comprised as to react during a given time interval, the interval being dependent upon and constantly modified by such external physical conditions as temperature, moisture, light, radiation, or pressure. During the timing period the device can either give a changing color display which is matched in rate to the declining freshness of a food or medicine in a container to which the device is attached or can cause the appearance or disappearance of words or symbols or sticky areas or odors. A variety of means for activating the timer are possible.

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patent: 3511608 (1970-05-01), Anderson
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patent: 3695903 (1972-10-01), Telkes et al.
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patent: 3954011 (1976-05-01), Manske
patent: 4038873 (1977-08-01), Kimmel
patent: 4057029 (1977-11-01), Seiter

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