Phthalide derivatives and recording system utilizing the same

Details Phthalide derivatives and recording system utilizing the same Phthalide derivatives and recording system utilizing the same

1986-06-11

1987-04-14

Hess, Bruce H.

Recorders

Record receiver deforming

346223, 427151, B41M 516, B41M 518, B41M 522

Patent

active

046582762

ABSTRACT:
A new phthalide derivative useful as a colorless chromogenic material has the following formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 have the same meaning as defined hereinbefore.

REFERENCES:
patent: 4591888 (1986-05-01), Satake et al.

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