Patents by Inventor Stephen Jeffery

Stephen Jeffery 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 the preparation of bis(pentadienyl)-complexes of iron group metals
    Patent number: 7893290
    Abstract: A method for preparing organometallic complexes of the general formula (I): M(RPD)2??(I) in which M may be iron, ruthenium, or osmium, R is hydrogen or an alkyl group having about 1 to 4 carbon atoms, and PD is a cyclic or open chain dienyl system that is known to form a sandwich type complex is provided. The complexes having formula (I) have a metal purity of at least about 99.99%. The method involves reacting a M(III) trichloride hydrate with an HRPD compound and at least one reducing metal, such as aluminum, in an alcohol solvent.
    Type: Grant
    Filed: April 13, 2010
    Date of Patent: February 22, 2011
    Assignee: W.C. Heraeus GmbH
    Inventors: Jan Schapp, Kevin King, Stephen Jeffery
  • Process for the preparation of platinum acetylacetonato complexes
    Patent number: 7442820
    Abstract: Preparation of halogenide-free Platinum(II)acetylacetonate [Pt(acac)2] Platinum(II) hexafluoroacetylacetonate [Pt(hfac)2], Platinum(II) trifluoroacetylacetonate [Pt(tfac)2] or Platinum(II)-alkylsubstituted acetylacetonates by the reaction of a halogen free platinum (IV) oxo- or hydroxo-compound, such as PtO2.nH2O (n being an integer from 1 to 4) or H2Pt(OH)6 or Na2Pt(OH)6 or K2Pt(OH)6, with a reducing agent in aqueous solution in the presence of a stoichiometric or higher amount of acetylacetone (acac), potassium acetylacetoante (Kacac) sodium acetylacetonate (Naacac), hexafluoroacetylacetone (hfac), trifluoroacetylacetone (tfac) or alkyl substituted acetylacetones or their salts and an H+ donor.
    Type: Grant
    Filed: January 25, 2008
    Date of Patent: October 28, 2008
    Assignee: W.C. Heraeus GmbH
    Inventors: Steffen Voss, Dongshui Zeng, Stephen Jeffery, Kevin King