Patents by Inventor Udo Dettmeier

Udo Dettmeier 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 preparing dimethyl vinylphosphonate from dimethyl 2-acetoxyethanephosphonate
    Patent number: 5763637
    Abstract: The invention relates to a process for preparing dimethyl vinylphosphonate by thermal dissociation of dimethyl 2-acetoxyethanephosphonate in the gas phase, which comprises vaporizing dimethyl 2-acetoxyethanephosphonate and dissociating it without catalysis at a temperature of from 400.degree. to 700.degree. C. into dimethyl vinylphosphonate and acetic acid.
    Type: Grant
    Filed: January 17, 1996
    Date of Patent: June 9, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Knut Riedel, Udo Dettmeier, Guenter Roscher
  • Process for the preparation of monoisopropylnaphthalene
    Patent number: 5396012
    Abstract: Process for the preparation of monoisopropylnaphthalene by alkylation of naphthalene with the aid of zeolites of the faujasite type as catalysts, wherein the cations of the zeolites have been replaced by alkaline earth metal ions.
    Type: Grant
    Filed: November 24, 1992
    Date of Patent: March 7, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Marita Neuber, Udo Dettmeier, Ernst I. Leupold
  • Process for the purification of organic compounds contaminated by dissolved metal compounds
    Patent number: 5367104
    Abstract: Process for the purification of organic compounds contaminated by dissolved metal compounds.The present invention relates to a process for the purification of organic compounds contaminated by dissolved metal compounds, by bringing the contaminated organic compound into contact with an ion exchanger resin, the functional group of which contains both a secondary amine group and a phosphonate salt radical and/or a phosphonic acid radical.
    Type: Grant
    Filed: March 16, 1994
    Date of Patent: November 22, 1994
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Ernst I. Leupold, Udo Dettmeier, Gustav Gimpel, Walter Reimann
  • Process for separating catalysts from suspensions by filtration
    Patent number: 5230804
    Abstract: The process for separating off rare metal catalysts used in the preparation of ether-carboxylic acids by catalytic oxidation with a suspended catalyst comprises carrying out a crossflow filtration and pretreating the filter elements used with a medium which is not solid under the treatment conditions and is composed of one or more carboxylic acids.
    Type: Grant
    Filed: March 17, 1992
    Date of Patent: July 27, 1993
    Assignee: Hoechst AG
    Inventors: Ernst I. Leupold, Eduard Zeisberger, Manfred Kauffelt, Willi Herzog, Udo Dettmeier, Georg Weichselbaumer
  • Production of 2-chlorobutadiene-1,3
    Patent number: 3978146
    Abstract: Production of 2-chlorobutadiene-(1,3) by the dehydrochlorination of 3,4-dichlorobutene-(1) in an aqueous solution of an alkali metal or alkaline earth metal hydroxide in the presence of an alcohol having between 2 and 4 carbon atoms at elevated temperature, and distilling off resulting 2-chlorobutadiene-(1,3).
    Type: Grant
    Filed: February 10, 1975
    Date of Patent: August 31, 1976
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Alexander Ohorodnik, Udo Dettmeier, Klaus Gehrmann, Heinz-Josef Berns
  • Tertiary phosphine
    Patent number: 3948980
    Abstract: Novel tertiary phosphine oxides containing in one radical at least two hydroxy groups or functional derivatives thereof are obtained by adding olefins having at least two hydroxy groups or functional derivatives thereof to secondary phosphine oxides at elevated temperatures in the presence of a free radical generator. The products are useful as flame-retardant agents and intermediates for anti-corrosive agents and pesticides.
    Type: Grant
    Filed: May 31, 1974
    Date of Patent: April 6, 1976
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Udo Dettmeier, Hans-Jerg Kleiner