Patents by Inventor Douglas Spahr

Douglas Spahr 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).

  • Publication number: 20080085967
    Abstract: The disclosure is directed to a method for reducing the chemical activity and photo activity of titanium dioxide nanoparticles comprising adding an amorphous alumina-stabilizing agent, specifically an anion, such as citric acid, to an aqueous slurry of the titanium dioxide nanoparticles; treating the aqueous slurry with a source of alumina, such as a solution of sodium aluminate, to form alumina-treated titanium dioxide nanoparticles; recovering the alumina-treated inorganic nanoparticles, wherein the nanoparticles have a particle size of about 50 to about 300 nm; and milling the nanoparticles to form nanoparticles having a particle size about 15% smaller than silica-treated inorganic nanoparticles milled under similar conditions. The titanium dioxide nanoparticles described herein are useful in cosmetic, coating and thermoplastic compositions.
    Type: Application
    Filed: August 6, 2007
    Publication date: April 10, 2008
    Inventors: Scott Frerichs, William Morrison, Douglas Spahr
  • Publication number: 20060264552
    Abstract: The disclosure is directed to a method for reducing the chemical activity and photo activity of titanium dioxide nanoparticles comprising adding an amorphous alumina-stabilizing agent, specifically an anion, such as citric acid, to an aqueous slurry of the titanium dioxide nanoparticles; treating the aqueous slurry with a source of alumina, such as a solution of sodium aluminate, to form alumina-treated titanium dioxide nanoparticles; recovering the alumina-treated inorganic nanoparticles, wherein the nanoparticles have a particle size of about 50 to about 300 nm; and milling the nanoparticles to form nanoparticles having a particle size about 15% smaller than silica-treated inorganic nanoparticles milled under similar conditions. The titanium dioxide nanoparticles described herein are useful in cosmetic, coating and thermoplastic compositions.
    Type: Application
    Filed: May 23, 2005
    Publication date: November 23, 2006
    Inventors: Scott Frerichs, William Morrison, Douglas Spahr
  • Publication number: 20060173112
    Abstract: Disclosed is a composition comprising or produced from nanoparticle-sized TiO2, an ethylene copolymer or ionomer of the ethylene copolymer, and optionally a second polymer. Also disclosed are films and other shaped articles produced therefrom. The composition, possessing a UV light barrier, can be used to protect the products that may be susceptible to UV such as foodstuffs.
    Type: Application
    Filed: January 31, 2005
    Publication date: August 3, 2006
    Inventors: Christina Troelzsch, John Paul, Austin Reid, Mark Wetzel, Douglas Spahr
  • Publication number: 20060027484
    Abstract: The present invention relates to dispersion compositions comprising synthetic oils or other heat transfer fluids and fine particles. The compositions also comprise at least one dispersant. The dispersion compositions have improved thermal conductivity properties, which may translate to improved energy efficiency performance in a variety of heat transfer applications. Such applications include vapor compression air conditioning and refrigeration systems of all types, secondary heat transfer fluids, and other heating or cooling fluid applications.
    Type: Application
    Filed: July 29, 2005
    Publication date: February 9, 2006
    Inventors: Thomas Leck, Douglas Spahr, Walter Mahler
  • Publication number: 20050106310
    Abstract: This invention describes a process for agglomerating particles into fractal structures of designed size and distribution. The present invention relates generally to the production of particle agglomerates, tailored to a specific size and structure, from initially dispersed particles.
    Type: Application
    Filed: July 1, 2004
    Publication date: May 19, 2005
    Inventors: John Green, Marc Sommer, Douglas Spahr, Norman Wagner