Patents by Inventor Philip D. DuBois

Philip D. DuBois 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 coating silica spheres
    Patent number: 5196267
    Abstract: Silica microspheres formed by hydrolysis of a silica precursor having a mean diameter in the range of about 0.1 to 10 .mu.m are provided with a thin surface layer, often a monolayer, of a metal to provide the appearance of a solid particle of the metal as its oxide. The microspheres are contacted with an aqueous or alcoholic solution of a metal compound to deposit the surface layer.
    Type: Grant
    Filed: June 21, 1991
    Date of Patent: March 23, 1993
    Assignee: Allied-Signal Inc.
    Inventors: Timothy J. Barder, Philip D. DuBois
  • Process for forming highly uniform silica spheres
    Patent number: 4983369
    Abstract: A process for producing highly uniform microspheres of silica having an average diameter of 0.1-10 .mu.m from the hydrolysis of a silica precursor, such as tetraalkoxysilanes, which is characterized by employing precursor solutions and feed rates which initially yield a two-phase reaction mixture.
    Type: Grant
    Filed: November 22, 1989
    Date of Patent: January 8, 1991
    Assignee: Allied-Signal Inc.
    Inventors: Timothy J. Barder, Philip D. DuBois