Apparatus for visually indicating elapsed time by a color change

Details Apparatus for visually indicating elapsed time by a color change Apparatus for visually indicating elapsed time by a color change

1976-03-05

1977-06-14

Swisher, S. Clement

Signals and indicators

Navigation devices

116114AM, G04F 1300

Patent

active

040288765

ABSTRACT:
Apparatus for visually indicating elapsed time by a color change is disclosed comprising a first and second chromophoric compound that are combined with one another through a matrix which controls the rate of combination of the compounds so that a color body is produced by the reaction of the compounds over a period of time that may be adjustable from anywhere from about one to about thirty days. The device comprises a transparent container having a rupturable capsule therein in which the first composition is contained. A transparent matrix surrounding the second composition is also in the container. The device may be secured to a surface by means of a mechanical fastener or an adhesive layer.

REFERENCES:
patent: 2552477 (1951-05-01), Cole
patent: 3018611 (1962-01-01), Biritz
patent: 3059474 (1962-10-01), Keller
patent: 3932134 (1976-01-01), Fang

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