Photochronic compounds of the indolino-spiro-benzoxazine type

Details Photochronic compounds of the indolino-spiro-benzoxazine type Photochronic compounds of the indolino-spiro-benzoxazine type

1991-12-05

1993-08-03

Rizzo, Nicholas S.

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

Organic compounds

Chalcogen in the nitrogen containing substituent

544101, G02B 523

Patent

active

052330389

ABSTRACT:
The invention relates to novel photochromic compounds of the family of indolino-spiro-oxazines, these compounds being distinguished by the fact that they correspond to the formula of an indolino-spiro-benzo-cyclodiazene.

REFERENCES:
patent: 3929783 (1975-12-01), Krapdio et al.
patent: 4699473 (1987-10-01), Chu
patent: 4720547 (1988-01-01), Kwak et al.

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