Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1975-04-10
1977-04-26
Daus, Donald G.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
2603432F, 2603433R, C07D30788
Patent
active
040200566
ABSTRACT:
A chromogenic compound of normally colorless form is disclosed having the following structural formula: ##STR1## wherein A and B can be ##STR2## X, Y and Z can be, among several others, hydrogen, alkyl, alkoxy, aryl, and heterocyclic, substituted and unsubstituted; and E can be a broad family of aromatic and heterocyclic structures. The compound is eligible for use in pressure-sensitive record materials and manifold marking systems. Because of light absorption characteristics, selected compounds of this invention are especially useful where machine readability and machine copiability are important.
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Daus Donald G.
McKinney E. Frank
NCR Corporation
Tovar Jose
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