Patents by Inventor Heinz-Dieter Buhnen

Heinz-Dieter Buhnen 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 ethylene copolymers, and their use as additives to mineral oil and mineral oil distillates
    Patent number: 6969746
    Abstract: Process for the preparation of ethylene copolymers, and their use as additives to mineral oil and mineral oil distillates. The invention relates to a process for the preparation of terpolymers of ethylene and at least 2 further olefinically unsaturated compounds by polymerization in a tubular reactor fitted with at least one side branch, wherein the fresh monomer components, which are introduced into the tubular reactor via the reactor inlet (the primary stream) or via the side branch or side branches (secondary stream or secondary streams), in each of the streams contain ethylene and at most one further olefinically unsaturated compound.
    Type: Grant
    Filed: December 30, 2003
    Date of Patent: November 29, 2005
    Assignee: Clariant GmbH
    Inventors: Matthias Krull, Werner Reimann, Wilhelm Zoller, Di Heinz Dieter Bühnen, Gerhard Bettermann
  • PROCESS FOR THE PREPARATION OF ETHYLENE COPOLYMERS, AND THEIR USE AS ADDITIVES TO MINERAL OIL AND MINERAL OIL DISTILLATES
    Publication number: 20040152849
    Abstract: The invention relates to a process for the preparation of terpolymers of ethylene and at least 2 further olefinically unsaturated compounds by polymerization in a tubular reactor fitted with at least one side branch, wherein the fresh monomer components, which are introduced into the tubular reactor via the reactor inlet (the primary stream) or via the side branch or side branches (secondary stream or secondary streams), in each of the streams contain ethylene and at most one further olefinically unsaturated compound.
    Type: Application
    Filed: December 30, 2003
    Publication date: August 5, 2004
    Inventors: Matthias Krull, Werner Reimann, Wilhelm Zoller, Heinz Dieter Buhnen, Gerhard Bettermann
  • Process for the preparation of ethylene copolymers, and their use as additives to mineral oil and mineral oil distillates
    Patent number: 6762253
    Abstract: The invention relates to a process for the preparation of terpolymers of ethylene and at least 2 further olefinically unsaturated compounds by polymerization in a tubular reactor fitted with at least one side branch, wherein the fresh monomer components, which are introduced into the tubular reactor via the reactor inlet (the primary stream) or via the side branch or side branches (secondary stream or secondary streams), in each of the streams contain ethylene and at most one further olefinically unsaturated compound.
    Type: Grant
    Filed: September 18, 2001
    Date of Patent: July 13, 2004
    Assignee: Clariant GmbH
    Inventors: Matthias Krull, Werner Reimann, Wilhelm Zoller, Heinz Dieter Bühnen, Gerhard Bettermann
  • Process for the preparation of ethylene copolymers, and their use as additives to mineral oil and mineral oil distillates
    Patent number: 6509424
    Abstract: The invention relates to a process for the preparation of terpolymers of ethylene and at least 2 further olefinically unsaturated compounds by polymerization in a tubular reactor fitted with at least one side branch, wherein the fresh monomer components, which are introduced into the tubular reactor via the reactor inlet (the primary stream) or via the side branch or side branches (secondary stream or secondary streams), in each of the streams contain ethylene and at most one further olefinically unsaturated compound.
    Type: Grant
    Filed: December 8, 1998
    Date of Patent: January 21, 2003
    Assignee: Clariant GmbH
    Inventors: Matthias Krull, Werner Reimann, Wilhelm Zoller, Heinz Dieter Bühnen, Gerhard Bettermann
  • Process for the preparation of ethylene copolymers, and their use as additives to mineral oil and mineral oil distillates
    Publication number: 20020028890
    Abstract: Process for the preparation of ethylene copolymers, and their use as additives to mineral oil and mineral oil distillates.
    Type: Application
    Filed: September 18, 2001
    Publication date: March 7, 2002
    Inventors: Matthias Krull, Werner Reimann, Wilhelm Zoller, Heinz Dieter Buhnen, Gerhard Bettermann
  • Process for separating volatile components from reaction mixtures obtained through high-pressure polymerization
    Patent number: 5200486
    Abstract: Separation of volatile components from the polymer melts formed during the homopolymerization of ethylene or the copolymerization of ethylene with other copolymerizable compounds at elevated pressures and elevated temperatures by countercurrent treatment with ethylene. Superior separations are obtained by the process.
    Type: Grant
    Filed: November 6, 1991
    Date of Patent: April 6, 1993
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Heinz Beckemeier, Heinz-Dieter Buhnen, Herbert Mercamp, Wilhelm Zoller