Patents by Inventor Alfred Oberholz

Alfred Oberholz 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).

  • Method of carrying out chemical reactions in reaction distillation columns
    Patent number: 5518699
    Abstract: Carrying out a chemical reaction in a reaction distillation column on an inorganic catalyst in the form of a column packing material which is maintained above the column bottom permits the use of high reaction temperatures and the easy removal or replacement of inactivated catalyst.
    Type: Grant
    Filed: July 8, 1994
    Date of Patent: May 21, 1996
    Assignee: Huels Aktiengesellschaft
    Inventors: John Kashnitz, Frank Steding, Alfred Oberholz, Franz Nierlich, Bernd Nowitzki
  • Process for the preparation of alkyl polyglycosides
    Patent number: 5461144
    Abstract: C.sub.8-18 alkylpolyglycosides are prepared by reacting a C.sub.1-6 alkyl glycoside with a C.sub.8-18 alcohol in a reaction column.
    Type: Grant
    Filed: November 12, 1993
    Date of Patent: October 24, 1995
    Assignee: Huels Aktiengesellschaft
    Inventors: John Kahsnitz, Stefan Schmidt, Alfred Oberholz
  • Process for the preparation of alkyl glycosides and alkyl oligoglycosides
    Patent number: 5227480
    Abstract: Alkyl glycosides and alkyl oligoglycosides of low iodine color number can be preparedby acid-catalyzed condensation of saccharides in an aqueous solution with short-chain alcohols at elevated temperature in a counter-current reaction column.
    Type: Grant
    Filed: October 18, 1991
    Date of Patent: July 13, 1993
    Assignee: Huels Aktiengesellschaft - PB 15
    Inventors: Alfred Oberholz, John Kahsnitz, Stefan Schmidt
  • Process for the preparation of esters
    Patent number: 5177229
    Abstract: Alcohols and acids are esterified by means of liquid-phase equilibrium reactions on ion exchangers in an apparatus comprising a prereactor and a rectifying column with external reactors. The process is characterized by the fact that a portion of one of the starting compounds is fed directly to the external reactors.
    Type: Grant
    Filed: July 10, 1991
    Date of Patent: January 5, 1993
    Assignee: Huls Aktiengesellschaft
    Inventors: John Kahsnitz, Alfred Oberholz, Udo Knippenberg, Michael Zolffel
  • Process for the production of 2,6-di-tert-butylphenol
    Patent number: 5091594
    Abstract: For producing 2,6-di-tert-butylphenol and products therefrom, utilizing small quantities of aluminum tris-(2-tert-butylphenolate as a catalyst by reaction of 2-tert-butylphenol with isobutene in the liquid phase, the reaction is performed in the presence of diluents such as liquid saturated aliphatic or cycloaliphatic hydrocarbons, C.sub.5 -C.sub.16 alkenes of formula R.sub.1 --CH.dbd.CH.sub.2 or R.sub.2 --CH.dbd.CH--R.sub.3, C.sub.5 to C.sub.12 cycloalkenes, which contain no branching on the C.dbd.C-bond, excess isobutene or mixtures thereof, at temperatures of 0.degree. C. to 80.degree. C., pressures of 0.1 to 11 bars and catalyst amounts of 0.005 to 5 mol %, based on 2-tert-butylphenol. High conversions are obtained with few undesirable trialkylated products.
    Type: Grant
    Filed: December 11, 1990
    Date of Patent: February 25, 1992
    Assignee: Huels Aktiengesellschaft
    Inventors: Friedrich-Wilhelm Kupper, Wolfgang H. E. Muller, Alfred Oberholz
  • Transparent, impact-resistant molding compositions based on polyvinyl chloride
    Patent number: 4581414
    Abstract: Molding compositions based on polyvinyl chloride contain as the component imparting impact resistance homo- and copolymeric acrylic acid esters of oxethylates of phenol or of substituted phenols, wherein the difference of the indices of refraction n.sub.D.sup.20 (at least 20.degree. C., measured with the Na D line) between the basic polymer and the component imparting impact resistance at most is .+-.0.01; optionally copolymers with other acrylic acid esters can also be used in the molding compositions. The latter are inexpensive to manufacture and, besides transparency and weatherability, also have impact resistance.
    Type: Grant
    Filed: May 4, 1984
    Date of Patent: April 8, 1986
    Assignee: Huels Aktiengesellschaft
    Inventors: Bernhard Stutzel, Friedrich-Wilhelm Kupper, Alfred Oberholz, Alfred Wieland