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US 3,940,410 AGranted
Bis-benzonazoledicarbonitriles
AssigneeSandoz Ltd., (Sandoz AG)
InventorHans Kittl
Life of this patent
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Abstract
Disclosed are compounds of formula I ##SPC1## in which n signifies 2 or 3, Their production and use as optical brighteners, particularly for polymeric and textile substrates.
Claims3
A compound of formula I, ##SPC11##
- in which n signifies 2 or 3.
Dependencies are inferred from the claim text.