Patents by Inventor Alex I. Shakhnovich

Alex I. Shakhnovich 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).

  • Modified organic colorants and dispersions, and methods for their preparation
    Patent number: 6936097
    Abstract: The present invention relates to methods of preparing modified organic colorant dispersions comprising the step of combining, in any order, i) an organic colorant; ii) an hydroxide reagent; and iii) an aqueous medium, to form a modified organic colorant dispersion. The methods further comprises a particle size reduction step. These steps can occur in either order. The organic colorant comprises at least one organic species having at least one ester group. Modified organic colorants and inkjet ink compositions are also disclosed.
    Type: Grant
    Filed: April 16, 2003
    Date of Patent: August 30, 2005
    Assignee: Cabot Corporation
    Inventor: Alex I. Shakhnovich
  • Modified organic colorants and dispersions, and methods for their preparation
    Publication number: 20040206275
    Abstract: The present invention relates to methods of preparing modified organic colorant dispersions comprising the step of combining, in any order, i) an organic colorant; ii) an hydroxide reagent; and iii) an aqueous medium, to form a modified organic colorant dispersion. The methods further comprises a particle size reduction step. These steps can occur in either order. The organic colorant comprises at least one organic species having at least one ester group. Modified organic colorants and inkjet ink compositions are also disclosed.
    Type: Application
    Filed: April 16, 2003
    Publication date: October 21, 2004
    Inventor: Alex I. Shakhnovich
  • Sulfur dyes
    Patent number: 5961670
    Abstract: New sulfur dyes comprising in their preparation at least one sulfur dye intermediate of the formula I ##STR1## wherein R and R.sub.1 are independently nitro, nitroso or amino, are produced by including in their preparation at least one modifying agent selected from the group of: A) an aldehyde; B) urea; C) a benzoquinone or naphthoquinone; and D) monoethanolamine or by treating an already prepared sulfur dye involving such an intermediate in its preparation, with at least one aldehyde, benzoquinone or naphthoquinone or with monoethanolamine.
    Type: Grant
    Filed: October 30, 1996
    Date of Patent: October 5, 1999
    Assignee: Clariant Finance (BVI) Limited
    Inventors: Philip N. Cote, Xiangfu Lan, Alex I. Shakhnovich, Manuel Jose Domingo