Long term rapid color changing time indicator

Details Long term rapid color changing time indicator Long term rapid color changing time indicator

1994-02-10

1997-05-27

Roskoski, Bernard

Horology: time measuring systems or devices

Miscellaneous

116200, G04B 1700

Patent

active

056338350

ABSTRACT:
A time indicator that rapidly changes color after a specific time interval is provided. The time indicator includes a base substrate with colored dye deposited on a first surface; a barrier applied over the colored dye; and a substrate having an adhesive on a first surface thereof. The substrate and the base substrate are put into adhesive contact. The adhesive coacts with the barrier to dissolve the barrier in a specified time interval. The adhesive then contacts the colored dye to dissolve the dye and permit the dye to migrate through the adhesive to cause a color change visible through the substrate.

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Supplementary European Search Report, Communication and Claims of Foreign Application as Submitted to us by Foreign Associate.

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