Patents by Inventor Stephen A. Matchett

Stephen A. Matchett 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).

  • Removing silica from cooling waters with colloidal alumina and dialysis
    Patent number: 5512181
    Abstract: The-silica content of cooling water blow-down waters is reduced by contacting these waters with a colloidal alumina which adsorbs a portion of the silica. The blow-down is then dialyzed to produce a permeate having a reduced silica content. In a preferred embodiment of the invention the permeate is recycled.
    Type: Grant
    Filed: November 1, 1993
    Date of Patent: April 30, 1996
    Assignee: Nalco Chemical Company
    Inventor: Stephen A. Matchett
  • Production of lead zirconate titanates using zirconia sol as a reactant
    Patent number: 5308807
    Abstract: The invention provides a method for producing a lead zirconate-lead titanate ceramic material (PZT ceramic) that exhibits higher fired density than conventional PZT ceramics and approximately equal electrical properties. The method employs zirconium oxide sol, containing extremely small zirconium oxide particles, as a raw material.
    Type: Grant
    Filed: January 26, 1993
    Date of Patent: May 3, 1994
    Assignee: Nalco Chemical Company
    Inventors: Kevin J. Moeggenborg, Stephen A. Matchett
  • Functionalized colloidal silica sol as a ceramics additive
    Patent number: 5168082
    Abstract: The invention provides a ceramic composition including as an additive a functionalized colloidal silica sol. The ceramic composition of the invention having an increased green strength.
    Type: Grant
    Filed: August 12, 1991
    Date of Patent: December 1, 1992
    Assignee: Nalco Chemical Company
    Inventors: Stephen A. Matchett, Kevin J. Moeggenborg
  • Method of preparing metallocene compounds
    Patent number: 5124464
    Abstract: This invention describes a novel method of preparing metallocene compounds. The invention is based on synthesis of novel bis cyclopentadienides that, under appropriate conditions, will either encapsulate a transition metal to produce a metallocene such as ferrocene, or ferrocene derivative, or will yield a polymeric metallocene. Compounds produced by this process are useful as catalysts in propulsion systems, or as anti-knock compounds in gasolines.
    Type: Grant
    Filed: June 15, 1989
    Date of Patent: June 23, 1992
    Assignee: Brandeis University
    Inventors: Myron Rosenblum, Stephen A. Matchett
  • Hydrothermal process for producing zirconia sol
    Patent number: 5037579
    Abstract: The present invention provides a novel hydrothermal process for producing zirconia sol comprising the following steps: mixing zirconium acetate with diluted glacial acetic acid to form a zirconium acetate/glacial acetic acid solution, wherein the molar ratio of glacial acetic acid to zirconium acetate as zirconia is in the range between about 7-20; and heating the zirconium acetate/glacial acetic acid solution to a temperature of at least 160.degree. C., thereby forming a zirconia sol.
    Type: Grant
    Filed: February 12, 1990
    Date of Patent: August 6, 1991
    Assignee: Nalco Chemical Company
    Inventor: Stephen A. Matchett
  • Method of preparing metallocene compounds
    Patent number: 4851598
    Abstract: This invention describes a novel method of preparing metallocene compounds. The invention is based on synthesis of novel bis cyclopentadienides that, under appropriate conditions, will either encapsulate a transition metal to produce a metallocene such as ferrocene, or ferrocene derivative, or will yield a polymeric metallocene. Compounds produced by this process are useful as catalyst in propulsion systems, or as anti-knock compounds in gasolines.
    Type: Grant
    Filed: December 28, 1987
    Date of Patent: July 25, 1989
    Assignee: Brandeis University
    Inventors: Myron Rosenblum, Stephen A. Matchett