Patents by Inventor Robert E. Kohrman

Robert E. Kohrman 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).

  • Stabilizer composition for dyestuffs
    Patent number: 3947247
    Abstract: A stabilizer compound for dyestuffs is prepared by reacting a quaternary heterocyclic nitrogeneous compound and an azo derivative. The reaction is carried out in a non-acid medium. The stabilizers produced from the condensation reaction hereof can be subsequently reacted with suitable dye forming or coupling compounds to form a dyestuff. Dyestuffs produced hereby are useful in dyeing both natural or cellulosic fibers as well as synthetic fibers. The products hereof are useful as printing compositions and evidence excellent shelf life.
    Type: Grant
    Filed: October 31, 1973
    Date of Patent: March 30, 1976
    Assignee: Central Michigan University Board of Trustees
    Inventors: Robert E. Kohrman, Pratap G. Phadtare