Patents by Inventor Friedrich Zell

Friedrich Zell 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 high-purity zirconium, hafnium, tantalum and niobium alkoxides
    Patent number: 7273943
    Abstract: A novel process for the preparation of high-purity zirconium, hafnium, tantalum and niobium alkoxides (alcoholates), novel tantalum and niobium compounds and a process for their preparation are provided. The process comprises the steps of mixing crude metal alkoxides M(OR)x having a halogen impurity of at least 0.05 wt. %, with an alcohol ROH, in which R is a C1-C12-alkyl radical, and subsequently or simultaneously metering in an excess of ammonia, based on the amount of mononuclear or polynuclear halogen-containing metal alkoxides.
    Type: Grant
    Filed: August 24, 2006
    Date of Patent: September 25, 2007
    Assignee: H. C. Starck GmbH
    Inventors: Knud Reuter, Friedrich Zell, Martina Ebner
  • Process for the preparation of high-purity zirconium, hafnium, tantalum and niobium alkoxides
    Publication number: 20070056468
    Abstract: A novel process for the preparation of high-purity zirconium, hafnium, tantalum and niobium alkoxides (alcoholates), novel tantalum and niobium compounds and a process for their preparation are provided. The process comprises the steps of mixing crude metal alkoxides M(OR)x having a halogen impurity of at least 0.05 wt. %, with an alcohol ROH, in which R is a C1-C12-alkyl radical, and subsequently or simultaneously metering in an excess of ammonia, based on the amount of mononuclear or polynuclear halogen-containing metal alkoxides.
    Type: Application
    Filed: August 24, 2006
    Publication date: March 15, 2007
    Applicant: H. C. Starck GmbH
    Inventors: Knud Reuter, Friedrich Zell, Martina Ebner
  • Process for preparing tantalum alkoxides and niobium alkoxides
    Patent number: 6548685
    Abstract: The invention relates to a process for preparing niobium(V) alkoxides and tantalum(V) alkoxides, in particular niobium(V) ethoxide and tantalum(V) ethoxide, by reacting NbCl5 or TaCl5 with an appropriate alcohol in the presence of ammonia, wherein NbCl5 or TaCl5 is dissolved at a temperature of from about 0° C. to −50° C. in the alcohol containing from about 5 to about 7 mol of ammonia per mol of NbCl5 or TaCl5 to be reacted.
    Type: Grant
    Filed: March 15, 2002
    Date of Patent: April 15, 2003
    Assignee: H.C. Starck GmbH
    Inventor: Friedrich Zell
  • Process for preparing tantalum alkoxides and niobium alkoxides
    Publication number: 20020143200
    Abstract: The invention relates to a process for preparing niobium(V) alkoxides and tantalum(V) alkoxides, in particular niobium(V) ethoxide and tantalum(V) ethoxide, by reacting NbCl5 or TaCl5 with an appropriate alcohol in the presence of ammonia, wherein NbCl5 or TaCl5 is dissolved at a temperature of from about 0° C. to −50° C. in the alcohol containing from about 5 to about 7 mol of ammonia per mol of NbCl5 or TaCl5 to be reacted.
    Type: Application
    Filed: March 15, 2002
    Publication date: October 3, 2002
    Inventor: Friedrich Zell