Pressure-sensitive copy system including ureido fluoran chromoge

Details Pressure-sensitive copy system including ureido fluoran chromoge Pressure-sensitive copy system including ureido fluoran chromoge

1975-09-08

1978-08-01

Lovering, Richard D.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

252316, 260335, 282 275, 427151, 427152, 428327, 428914, B32B 326

Patent

active

041044371

ABSTRACT:
A chromogenic compound having the structural formula ##STR1## wherein R.sup.1 and R.sup.2 each represent an alkyl group;

REFERENCES:
patent: 3328257 (1967-06-01), Vrancken et al.
patent: 3576660 (1971-04-01), Bayless et al.
patent: 3649649 (1972-03-01), Orita et al.
patent: 3669711 (1972-06-01), Kimura et al.
patent: 3703397 (1972-11-01), Lin et al.
patent: 3715226 (1973-02-01), Lin
patent: 3721576 (1973-03-01), Farber et al.
patent: 3730755 (1973-05-01), Lin

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