Patents by Inventor Walter B. Egger

Walter B. Egger has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Trichromatic azo dye mixtures and their use for dyeing cellulose and leather
    Patent number: 5032142
    Abstract: Trichromatic dye mixtures containing(i) as the orange componentat least one dye of the formula ##STR1## or a salt thereof, or, as the yellow component,at least one dye of the formula ##STR2## or a salt thereof, whereinR.sub.1 is hydrogen or C.sub.1-4 alkyl,R.sub.2 is hydrogen, C.sub.1-4 alkyl or substituted C.sub.1-4 alkyl,each of R.sub.3 and R.sub.4 is independently hydrogen, C.sub.1-6 alkyl or substituted C.sub.1-6 alkyl,R.sub.10 is hydrogen or C.sub.2-3 hydroxyalkyl, andR.sub.11 is C.sub.2-3 hydroxyalkyl or 2-(2'-hydroxyethoxy)ethyl, with the proviso that when R.sub.11 is 2-(2'-hydroxyethoxy)ethyl, R.sub.10 must be hydrogen,(ii) as the red component,at least one dye of the formula ##STR3## or a salt thereof, wherein each of D and D' is independently ##STR4## wherein m is 1 or 2, each R.sub.5 is independently hydrogen or C.sub.1-4 alkyl,each R.sub.6 is independently hydrogen, C.sub.1-4 alkyl or C.sub.2-4 hydroxyalkyl, andx is linear or branched C.sub.2-6 alkylene, linear or branched C.sub.
    Type: Grant
    Filed: December 21, 1989
    Date of Patent: July 16, 1991
    Assignee: Sandoz Ltd.
    Inventors: Walter B. Egger, Ernst Schnider