Patents by Inventor John Steven Gergely

John Steven Gergely 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).

  • Process for producing coated TiO.sub.2 pigment using cooxidation to provide hydrous oxide coatings
    Patent number: 5922120
    Abstract: The present invention provides a process for producing titanium dioxide (TiO.sub.2) pigment having a coating comprising silica and a second oxide selected from the group consisting of oxides of boron, phosphorus, magnesium, niobium, germanium, and mixtures thereof, comprising the steps of (a) reacting titanium tetrachloride (TiCl.sub.4) in the vapor phase with an aluminum compound and an oxygen-containing gas in a reactor at a temperature in the range of about 900.degree. C. to about 1600.degree. C. to provide a gaseous suspension comprising TiO.sub.2 particles, (b) contacting the gaseous suspension comprising the TiO.sub.2 particles with a silicon halide and an oxide precursor of boron, phosphorus, magnesium, niobium, germanium, and mixtures thereof, and (c) cooling the gaseous suspension to produce TiO.sub.2 pigment having a coating comprising silica and a second oxide.
    Type: Grant
    Filed: December 23, 1997
    Date of Patent: July 13, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Narayanan Sankara Subramanian, Pratibha Laxman Gai, Russell Bertrum Diemer, Jr., Alvin Allen, John Steven Gergely
  • Process for the addition of boron in a TiO.sub.2 manufacturing process
    Patent number: 5728205
    Abstract: The present invention provides a process for producing titanium dioxide (TiO.sub.2) pigment comprising boron oxide (B.sub.2 O.sub.3), comprising the steps of: (a) reacting titanium tetrachloride (TiCl.sub.4) in the vapor phase with an aluminum compound and an oxygen-containing gas in a reactor at a temperature in the range of about 900.degree. C. to about 1600.degree. C. to provide a gaseous suspension comprising TiO.sub.2 particles, and (b) contacting the gaseous suspension comprising the TiO.sub.2 particles with a boron compound to produce TiO.sub.2 pigment comprising B.sub.2 O.sub.3.
    Type: Grant
    Filed: December 11, 1996
    Date of Patent: March 17, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Alvin Allen, John Steven Gergely