Patents by Inventor Michael Wohlers

Michael Wohlers 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 and products of purification of anhydrosugar alcohols
    Patent number: 6670033
    Abstract: A process for the formation of a purified anhydrosugar alcohol is disclosed, whereby the resultant purified anhydrosugar alcohol has a purity of at least 99.8% and is substantially colorless. The anhydrosugar alcohol is purified by distillation, recrystallization from methanol, ethanol or ethylene glycol, melt recrystallization, or a combination thereof. Preferably, the purification is by distillation followed by recrystallization from methanol, ethanol or ethylene glycol. A test for determining the purity of the anhydrosugar alcohol is disclosed, wherein the color of the anhydrosugar alcohol after annealing at a temperature of at least 260° C. for at least four hours is examined. Alternatively, purity can be determined by examination of ultraviolet (UV) transmittance of the purified anhydrosugar alcohol at various wavelengths.
    Type: Grant
    Filed: November 27, 2001
    Date of Patent: December 30, 2003
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Michael A. Hubbard, Michael Wohlers, Helmut B. Witteler, Edward G. Zey, George Kvakovszky, Thomas H. Shockley, Larry F. Charbonneau, Norbert Kohle, Jochen Rieth
  • Method for the liquid-phase hydrogenation of organic materials
    Patent number: 6653509
    Abstract: A catalyst which consists of amorphous carbon with molecular planes that have curved surfaces and contain six-membered and non-six-membered carbon rings, optionally having at least one catalytically active, low-valency metal covalently bound thereto. Methods of producing the catalyst and applications thereof are included.
    Type: Grant
    Filed: April 15, 2002
    Date of Patent: November 25, 2003
    Assignee: Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V.
    Inventors: Robert Schlögl, Michael Wohlers, Thilo Belz, Thomas Braun
  • Continuous process for the production of anhydrosugar alcohols
    Patent number: 6639067
    Abstract: A process is described for continuous production of anhydrosugar alcohol by continuous introducing of sugar alcohols and/or monoanhydrosugar alcohols into a reaction vessel and dehydration in the presence of an acid catalyst and solvent in which the resultant reaction product is soluble. Water and the solvent having the dissolved reaction product are each cointinuously removed from the reaction vessel. The reaction product is separated from the removed solvent and the product is optionally purified to a purity of 99.0% the solvent is recycled in the reaction vessel.
    Type: Grant
    Filed: September 27, 2001
    Date of Patent: October 28, 2003
    Inventors: Willard C. Brinegar, Michael Wohlers, Michael A. Hubbard, Edward G. Zey, George Kvakovszky, Thomas H. Shockley, Rainer Roesky, Uwe Dingerdissen, Werner Kind
  • Catalyst, methods of producing it and methods of use
    Publication number: 20020132863
    Abstract: A catalyst which consists of amorphous carbon with molecular planes that have curved surfaces and contain six-membered and non-six-membered carbon rings, optionally having at least one catalytically active, low-valency metal covalently bound thereto. Methods of producing the catalyst and applications thereof are included.
    Type: Application
    Filed: April 15, 2002
    Publication date: September 19, 2002
    Applicant: Max Planck-Gesellschaft Zur Forderung Der Wissenscharten E.V.
    Inventors: Robert Schlogl, Michael Wohlers, Thilo Belz, Thomas Braun
  • Metal-fullerene intercalation compounds, process for their preparation and use as catalysts
    Patent number: 5523438
    Abstract: Metal-fullerene intercalation compounds, process for their preparation and use as catalystsTransition metal-fullerene intercalation compounds and a process for the preparation thereof by reaction of transition metal compounds with fullerenes or fullerene-containing carbon black with activation in a solvent.
    Type: Grant
    Filed: July 21, 1994
    Date of Patent: June 4, 1996
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Robert Schlogl, Harald Werner, Michael Wohlers