Chromogenic recording materials

Details Chromogenic recording materials Chromogenic recording materials

1986-05-20

1987-02-10

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D49310

Patent

active

046423575

ABSTRACT:
A compound of the formula (I) ##STR1## wherein R is methyl or ethyl, useful in chromogenic recording materials, is described.

REFERENCES:
patent: 3681390 (1972-08-01), Lin
patent: 3825561 (1974-07-01), Akamatsu et al.
patent: 4104437 (1978-08-01), Vincent et al.
patent: 4444591 (1984-04-01), Kawai et al.

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