Patents by Inventor Amrita Chakravarty

Amrita Chakravarty 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).

  • Hydrophobically modified pigment composition
    Patent number: 12297358
    Abstract: The present invention is a composition comprising an aqueous dispersion of metal oxide pigment particles coated with an organosilane polymer comprising structural units of an alkyltrihydroxysilane or a salt thereof, a dialkyldihydroxysilane or a salt thereof, and an ancillary alkylsilane triol. The composition of the present invention provides hydrophobicity to pigment particles, thereby imparting water resistance, and allows for high loadings of pigment in water without increased viscosity. The dispersion is further useful for providing stain and corrosion resistance in coatings arising from paints.
    Type: Grant
    Filed: October 1, 2020
    Date of Patent: May 13, 2025
    Assignees: The Regents of the University of California, Dow Global Technologies LLC, Rohm and Haas Company
    Inventors: David G. Barton, James C. Bohling, Juan F. Callejas, Amrita Chakravarty, Alexander Katz, Manish K. Mishra, Clayton J. Radke, Antony K. Van Dyk
  • HYDROPHOBICALLY MODIFIED PIGMENT COMPOSITION
    Publication number: 20220363908
    Abstract: The present invention is a composition comprising an aqueous dispersion of metal oxide pigment particles coated with an organosilane polymer comprising structural units of an alkyltrihydroxysilane or a salt thereof, a dialkyldihydroxysilane or a salt thereof, and an ancillary alkylsilane triol. The composition of the present invention provides hydrophobicity to pigment particles, thereby imparting water resistance, and allows for high loadings of pigment in water without increased viscosity. The dispersion is further useful for providing stain and corrosion resistance in coatings arising from paints.
    Type: Application
    Filed: October 1, 2020
    Publication date: November 17, 2022
    Inventors: David G. Barton, James C. Bohling, Juan F. Callejas, Amrita Chakravarty, Alexander Katz, Manish K. Mishra, Clayton J. Radke, Antony K. Van Dyk