Chemistry: physical processes – Physical processes – Crystallization
Patent
1976-02-13
1977-04-26
Wolk, Morris O.
Chemistry: physical processes
Physical processes
Crystallization
23254R, 116114AM, G01N 2112, G01N 3122
Patent
active
040198650
ABSTRACT:
The prolonged attainment of high concentrations of H.sub.2 S in a gaseous environment is indicated by a device which comprises a base, an enclosing upper surface which is transparent and water impenetrable, and a light stable composition enclosed by the base and upper surface, said composition undergoing a visible change in color or tone when exposed to a constant concentration of 1 part per million of H.sub.2 S for one day.
REFERENCES:
patent: 3223487 (1965-12-01), Grosskopf
patent: 3715192 (1973-02-01), Wenz
Chemical Abstracts, 66:34627n (1967).
Glasspoole Eileen A.
Sinclair Robin A.
Alexander Cruzan
Litman Mark A.
Marantz Sidney
Minnesota Mining and Manufacturing Company
Sell Donald M.
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