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US 4,892,937 AGranted
Tetra-substituted aryl cyclic formazan dyes
AssigneeEastman Kodak Company
InventorsMary H. Delton, Shari L. Eiff
Life of this patent
Estimating the term…
Abstract
Novel tetra-substituted aryl cyclic formazan dyes are useful in assaying for Li.sup.+.
Claims3
A dye having the structure ##STR6## wherein X represents CN or NO.sub.2 ;
- Y represents CH.sub.2 CH.sub.2, CH.sub.2 CH.sub.2 CH.sub.2, or CH.sub.2 CH.sub.2 --O--CH.sub.2 CH.sub.2 ;
- and
- R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each independently represent butyl, halogen, alkoxy or NO.sub.2.
Dependencies are inferred from the claim text.