Harness for working animal
Patent
1976-06-28
1977-09-20
Curtis, Allen B.
Harness for working animal
C09B 1702
Patent
active
040496490
ABSTRACT:
A novel class of soluble organic nitrogen compounds which produces various colors when dissolved in organic liquid solvents. These dyes produce a color from blue to red if the organic liquid medium has a neutral or basic pH which reversibly changes to yellow if the liquid medium has an acid pH. The color variation can also serve as an indication of solvent polarity.
REFERENCES:
patent: 2255077 (1941-09-01), Middleton
patent: 2742463 (1956-04-01), Finkelstein
L. G. S. Brooker et al., "Color & Constitution. XI-Anhydronium Bases of p-hydroxystyryl Dyes as Solvent Polarity Indicators" in J.A.C.S., vol. 73, pp. 5350-5356, Nov. 1951.
Phillips; A. P., "Condensation of Aromatic Aldehyde with Picoline Methiodide", J. Org. Chem., vol. 12, (1947), pp. 333-340.
Gaines, Jr. George L.
Lavallee Francois A.
Le Grand Donald G.
Curtis Allen B.
General Electric Company
Kempton Lawrence R.
McDevitt John F.
Neuhauser Frank L.
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