Chromogenic phthalides

Details Chromogenic phthalides Chromogenic phthalides

1991-05-14

1992-09-01

Raymond, Richard L.

Record receiver having plural interactive leaves or a colorless

Having a colorless color-former, developer therefor, or...

Identified color-former

548463, B41M 516

Patent

active

051438925

ABSTRACT:
Chromogenic phthalides of formula ##STR1## wherein X, R.sub.1 and R.sub.2 are each independently of the other C.sub.3 -C.sub.6 alkyl,

REFERENCES:
patent: 4055358 (1977-10-01), Ganner
patent: 4062866 (1977-12-01), Garner
patent: 4186134 (1980-01-01), Garner
patent: 4800193 (1989-01-01), Saeki
patent: 4803192 (1989-02-01), Saeki

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