Patents by Inventor Sathanjheri A. Ravishankar

Sathanjheri A. Ravishankar 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).

  • Kaolin clay glossing pigment and preparation thereof
    Patent number: 6585822
    Abstract: Novel nanosized kaolin clay particles are prepared by agitating a fine particle size fraction of kaolin clay in a Netzsch mill until the particle size is reduced, aspect ratio is decreased and surface area is increased. The ultrafine kaolin particles are especially useful as a pigment to provide high surface gloss to ink jet printing papers.
    Type: Grant
    Filed: January 5, 2001
    Date of Patent: July 1, 2003
    Assignee: Engelhard Corporation
    Inventors: Richard R. Berube, Michael G. Londo, Sathanjheri A. Ravishankar
  • Novel kaolin clay glossing pigment and preparation thereof
    Publication number: 20020129741
    Abstract: Novel nanosized kaolin clay particles are prepared by agitating a fine particle size fraction of kaolin clay in a Netzsch mill until the particle size is reduced, aspect ratio is decreased and surface area is increased. The ultrafine kaolin particles are especially useful as a pigment to provide high surface gloss to ink jet printing papers.
    Type: Application
    Filed: January 5, 2001
    Publication date: September 19, 2002
    Inventors: Richard R. Berube, Michael G. Londo, Sathanjheri A. Ravishankar
  • Composite aggregate pigments for the coating industry
    Patent number: 5755870
    Abstract: This invention discloses a process of making composite aggregate pigments (CAPs) having superior optical and dispersion characteristics. These pigments are produced by aggregating titanium dioxide and calcined clay with zirconium hydroxy complex chemicals in a slurry in the pH range of 6.0-10.5. Superior optical properties are obtained by heat treating the pigments after removal from the slurry. Multi-faceted pigments are obtained by including a small amount of a rod-shaped pigment, such as wollastonite, in the composite pigment.
    Type: Grant
    Filed: December 11, 1996
    Date of Patent: May 26, 1998
    Assignee: Dry Branch Kaolin Company
    Inventor: Sathanjheri A. Ravishankar
  • Way to synthesize structured composite premium pigments
    Patent number: 5690728
    Abstract: A structured composite pigment composed of TiO.sub.2, calcined clay and polyaluminum chloride (PAC). A novel process is disclosed for producing an aggregated composite premium pigment having superior optical, physical and dispersion characteristics for papermaking applications. The aggregated pigment is produced by chemically aggregating a mixture containing TiO.sub.2 and calcined clay with polyaluminum chloride of a basicity of 10-85% in alkaline conditions of pH 8.5-10.5.
    Type: Grant
    Filed: January 2, 1996
    Date of Patent: November 25, 1997
    Assignee: Nord Kaolin Company
    Inventor: Sathanjheri A. Ravishankar