Patents Represented by Attorney Earl Christensen

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  • Navy-blue nitrophenylazonaphthylamino dyes
    Patent number: 3970617
    Abstract: Disperse monoazo dyes which are useful for the dyeing and printing of polyester fibers in navy-blue shades and which are of the formula: ##SPC1##Wherein R.sub.1 is halogen or CN; R.sub.2 is CN or NO.sub.2 ; R.sub.3 is alkylene; and n is 3 or 4; said dyes having good lightfastness and good hydrolytic stability.
    Type: Grant
    Filed: March 7, 1974
    Date of Patent: July 20, 1976
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Salvatore A. Bruno