Chemistry: physical processes – Physical processes – Crystallization
Patent
1975-07-11
1978-05-30
Yudkoff, Norman
Chemistry: physical processes
Physical processes
Crystallization
73 27R, 116114AM, 428173, G01N 3100
Patent
active
040921190
ABSTRACT:
A scuff-resistant, waterproof environmental quality indicator suitable for field use to blot-test unknown spills or wet containers, as field markers of spray distribution, as floating markers of water contamination, as personnel protection badges and as integrating dosimeters. The environmental quality indicator has a topographically varying surface having substantially uniformly located raised portions defining the scuffing and abrasion level and relieved portions beneath the scuffing and abrasion level to protect the indicator formulation from physical environmental hazards, which can produce an initial false indication, while remaining freely exposed to chemical environmental hazards.
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Baier Robert E.
DePalma Vito A.
Calspan Corporation
Jaffe Allen J.
Yudkoff Norman
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