Indicator for display of elapsed times and/or of the moment when

Details Indicator for display of elapsed times and/or of the moment when Indicator for display of elapsed times and/or of the moment when

1992-05-04

1994-06-07

Cuchlinski, Jr., William A.

Signals and indicators

Indicators

Chemically activated type

G04F 1300

Patent

active

053179870

ABSTRACT:
An indicator for attachment to objects to display elapsed times and/or changes of state, in which a visible display is brought about by color change of the indicator upon reaction of chemical substances and with destruction of a barrier preliminarily separating the chemical substances. The barrier is a separating or covering layer that can be penetrated by selective pitting by a chemical substance preliminarily enclosed by the barrier. An embodiment of the invention includes selective pitting of the barrier member with a resulting visible change of the indicator. Another embodiment of the invention includes initial separation of two chemical substances that can react with one another with visible change, of which at least one reacts chemically with the barrier for the latter's penetration.

REFERENCES:
patent: 3520124 (1970-07-01), Myers
patent: 4028876 (1977-06-01), Delatorre
patent: 5045283 (1991-09-01), Patel
"Beitrag zur Theorie des Anlaufvorgangs" by Carl Wagner, pp. 25-41, Jan. 27, 1933.

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