Patents by Inventor Kevin P. Cusack

Kevin P. Cusack 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).

  • Purification of aqueous dye solutions
    Patent number: 6153789
    Abstract: The present invention provides a method of purifying an aqueous dye solution having an aldehyde and/or ketone impurity including a step of reacting the impurity with a hydrazine derivative, forming a water-insoluble hydrazone compound. The hydrazone compound is then removed from the solution to form a dye having an increased purity.
    Type: Grant
    Filed: June 29, 1999
    Date of Patent: November 28, 2000
    Assignee: BASF Corporation
    Inventors: Kevin P. Cusack, Kwang Kim, Dennis L. Edie, Benjamin S. Tennyson
  • Process for making high performance dyes
    Patent number: 6096889
    Abstract: An aromatic amino sulfonic acid compound is purified by a process including steps of:(a) dissolving the aromatic amino sulfonic acid compound in aqueous medium having a basic pH;(b) acidifying the aqueous medium with acetic acid to precipitate the aromatic amino sulfonic acid compound; and(c) removing the precipitated aromatic amino sulfonic acid compound from the aqueous medium.Using acetic acid in the process results in removal of more impurities and undesirable sulfate and chloride salts to provide an improved material for synthesizing dyes and pigments.
    Type: Grant
    Filed: June 1, 1999
    Date of Patent: August 1, 2000
    Assignee: BASF Corporation
    Inventors: Kevin P. Cusack, Louis Molinsek