Timing device

Details Timing device Timing device

2003-12-31

2008-10-14

Smith, R. A. (Department: 2841)

Signals and indicators

Indicators

Chemically activated type

C368S327000

Reexamination Certificate

active

07434535

ABSTRACT:
A timing device for visually determining the passage of a preselected period of time including a redox indicator and a metal salt wherein the indicator undergoes an observable change in color which is related to the desired preselected period of time.

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