Patents by Inventor Christoph Holzner

Christoph Holzner 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).

  • Phosphorus-containing compounds based on 1-hydroxypropane-1, 3-diphosphonic acid
    Patent number: 6090345
    Abstract: The present invention relates to phosphorus-containing compounds based on 1-hydroxypropane-1,3-diphosphonic acid and to the acid itself of general formula (I) ##STR1## in which M.sup.1, M.sup.2, M.sup.3, M.sup.4 and M.sup.5, independently of one another, each denote a radical from the series hydrogen, alkali metal, an equivalent of ammonium, alkyl- or hydroxyalkyl-substituted ammonium,a process for the preparation thereof, novel intermediates and the use thereof as a corrosion inhibitor, scale inhibitor and as a flame retardant.
    Type: Grant
    Filed: January 29, 1999
    Date of Patent: July 18, 2000
    Assignee: Bayer AG
    Inventors: Christoph Holzner, Armin Spaniol, Hans Dahmen
  • Dialkylphosphoric acids by the methanol method
    Patent number: 6034260
    Abstract: The present invention relates to a process for the preparation of symmetrically substituted phosphoric acid diesters of long-chain linear or branched alcohols of chain length C.sub.4 to C.sub.22.
    Type: Grant
    Filed: March 11, 1999
    Date of Patent: March 7, 2000
    Assignee: Bayer AG
    Inventors: Karl-Heinz Mitschke, Christoph Holzner
  • Extraction of acids and metal salts from aqueous solutions with diethyl dodecylphosphonate
    Patent number: 5682593
    Abstract: Use of diethyl dodecylphosphonate (DEDP) for the extraction of acids and metal salts from aqueous solutions.
    Type: Grant
    Filed: October 19, 1995
    Date of Patent: October 28, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Christoph Holzner, Hans-Dieter Block, Hans-Heinrich Moretto
  • Synthesis of an O,O' -diesters of thiophosphoric acid, an O-ester of thiophosphonic acid, or a thiophosphinic acid
    Patent number: 5641888
    Abstract: Preparing O,O'-diesters of thiophosphoric acid, O-monoesters of thiophosphonic acid or thiophosphinic acids and their salts, from diesters of phosphorous acid, monoesters of phosphorous acids or phosphinous acids and sulphur in the presence of an aqueous solution of an auxiliary base. The solutions can be used in further syntheses or as extraction agent for cations.
    Type: Grant
    Filed: January 18, 1996
    Date of Patent: June 24, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Christoph Holzner, Ottfried Schlak, Rosemarie Grizan, Johannes Jezierski
  • Production of 2-phosphonobutane-1,2,4-tricarboxylic acid and the alkali metal salts thereof
    Patent number: 5639909
    Abstract: This invention relates to an improved process for the production of 2-phosphono-butane-1,2,4-tricarboxylic acid (PBTC) and the alkali metal salts thereof, in which process dialkyl phosphite, preferably dimethyl or diethyl phosphite, and ethene-1,2-dicarboxylic acid dialkyl ester, in particular the dimethyl or diethyl ester of maleic acid and/or fumaric acid, are initially reacted in the presence of a basic catalyst to yield a phosphonosuccinic acid tetraalkyl ester, the resultant ester is thereupon reacted without further working up with acrylic acid alkyl ester, preferably methyl or ethyl acrylate, in the presence of an alkaline catalyst and the reaction product obtained in this manner is saponified without further working up to yield PBTC or the alkali metal salts thereof. The product when mixed with bleaching lye exhibits reduced chlorine depletion.
    Type: Grant
    Filed: May 20, 1996
    Date of Patent: June 17, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Christoph Holzner, Wolfgang Ohlendorf, Hans-Dieter Block, Horst Bertram, Roland Kleinstuck, Hans-Heinrich Moretto
  • Method of preparing dimethylamine-borane
    Patent number: 5565615
    Abstract: In the preparation of dimethylamine-borane by reacting an alkali metal or alkaline earth metal borohydride with a dimethylammonium salt, the improvement which comprises effecting the reaction in a liquid mixture comprising dimethylamine as a solvent and an additional organic solvent.
    Type: Grant
    Filed: March 30, 1995
    Date of Patent: October 15, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Christoph Holzner, Alfred Wagner, Dietrich Pantke, Hans-Dieter Block, Hans-Heinrich Moretto, Wolfgang Ohlendorf