pH indicator

Details pH indicator pH indicator

2011-03-01

2011-03-01

Alexander, Lyle A (Department: 1773)

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Calorimeter

C422S067000, C422S068100, C436S163000, C436S164000

Reexamination Certificate

active

07897105

ABSTRACT:
A pH indicator comprising a solid substrate coated at least partially by at least one layer of at least one substance, wherein said the and the substrate are having different colors and wherein the at least one substance is selected to dissolve or to decompose when exposed to predetermined pH values, thereby exposing said first color.

REFERENCES:
patent: 6395551 (2002-05-01), Kipke et al.
patent: 6801477 (2004-10-01), Braunberger

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