Patents by Inventor John W. Donovan

John W. Donovan 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).

  • Fiber reactive monoazo yellow dye
    Patent number: 5463033
    Abstract: A monoazo fiber reactive dye of the formula: ##STR1## wherein X and Y are independently selected from .beta.-sulfatoethyl, .beta.-thiosulfatoethyl and .beta.-phosphatoethyl group and R is hydrogen, and C.sub.1 -C.sub.4 alkyl; preferably methyl. These dyes are useful in conducting exhaust dyeings at low dye bath salt concentrations.
    Type: Grant
    Filed: July 13, 1994
    Date of Patent: October 31, 1995
    Assignee: Hoechst Celanase Corporation
    Inventors: John W. Donovan, Frank P. Lavieri