Patents by Inventor Wolfram Koegel

Wolfram Koegel 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 for producing expanded polyolefin particles
    Patent number: 6239185
    Abstract: A process comprises producing expanded polyolefin particles by impregnating polyolefin granules with a volatile blowing agent in suspension under pressure, and then releasing the pressure. The suspension medium has a lower density than the polyolefin granules and the suspension is practically free from suspension agents.
    Type: Grant
    Filed: February 25, 2000
    Date of Patent: May 29, 2001
    Assignee: BASF Aktiengesellschaft
    Inventors: Frank Braun, Klaus Hahn, Manfred Leibach, Wolfram Kögel, Isidoor De Grave
  • Polyolefin foams having a homogeneous cell structure
    Patent number: 5262446
    Abstract: Polyolefin foams having a density of from 0.01 to 0.1 g/cm.sup.3 and having 2 to 1000 cells/mm.sup.2 and containing a resin acid, a lower alkyl ester of a resin acid or (hydro) abietyl phthalate as organic foaming aid have a homogeneous cell structure.
    Type: Grant
    Filed: March 25, 1993
    Date of Patent: November 16, 1993
    Assignee: BASF Aktiengesellschaft
    Inventors: Isidoor de Grave, Wolfram Koegel, Klaus Hahn
  • Polyolefin foams having a homogeneous cell structure
    Patent number: 5234962
    Abstract: Polyolefin foams having a density of from 0.01 to 0.1 g/cm.sup.3 and having 2 to 1000 cells/mm.sup.2 and containing a resin acid, a lower alkyl ester or a resin acid or (hydro) abietyl phthalate as organic foaming aid have a homogeneous cell structure.
    Type: Grant
    Filed: January 8, 1993
    Date of Patent: August 10, 1993
    Assignee: BASF Aktiengesellschaft
    Inventors: Isidoor de Grave, Wolfram Koegel, Klaus Hahn
  • Foams based on an olefin copolymer
    Patent number: 5077322
    Abstract: Novel foams having a density of from 0.01 to 0.1 g/cm.sup.3, based on a copolymer comprising ethylene, propylene and a C.sub.4 - to C.sub.8 -.alpha.-olefin, and having a torsion modulus of from 100 to 800 N/mm.sup.2 have high tensile, compressive and flexural strengths and at the same time high elongation at break.
    Type: Grant
    Filed: April 12, 1991
    Date of Patent: December 31, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: Isidoor De Grave, Joachim Fischer, Wolfram Koegel, Hermann Tatzel, Onno Graalmann, Juergen Kerth, Rainer A. Werner
  • Expansion of shrunk foam particles of propylene polymers
    Patent number: 5045256
    Abstract: Foam particles of propylene polymers which have shrunk from 40 to 95% of their original volume and have a bulk density of from 10 to 30 g/1 can be expanded if they are treated with air or nitrogen under superatmospheric pressure, subsequently decompressed. If desired post-foamed by heating and, after aging, re-treated with air or nitrogen under superatmospheric pressure, subsequently decompressed and aged under atmospheric pressure until the pressure in the cells has dissipated.
    Type: Grant
    Filed: July 6, 1990
    Date of Patent: September 3, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: Isidoor De Grave, Udo Haardt, Wolfram Koegel, Fritz E. Krueckau, Hermann Tatzel
  • Aging-resistant fireproofing material
    Patent number: 4297252
    Abstract: A fireproofing material based on alkali metal silicates and containing from 20 to 60 percent by weight of water, which additionally contains from 1 to 10 percent by weight of a borate or an aluminate, preferably sodium aluminate, to improve the aging resistance. The fireproofing material can be used to insulate apertures and passages in building structures against the passage of fire and smoke, and can also be used as a fireproof glass.
    Type: Grant
    Filed: May 22, 1979
    Date of Patent: October 27, 1981
    Assignee: BASF Aktiengesellschaft
    Inventors: Arndt C. Caesar, Wolfram Koegel, Ludwig Zuern, Friedheim Gaertner
  • Manufacture of shaped articles of foamed olefin polymers
    Patent number: 4031179
    Abstract: Shaped articles are produced by heating and compressing particles of foamed olefin polymer containing crosslinked portions in molds, the pressure being reduced during compression in the mold.
    Type: Grant
    Filed: June 18, 1974
    Date of Patent: June 21, 1977
    Assignee: BASF Aktiengesellschaft
    Inventors: Hermann Tatzel, Wolfram Koegel, Gilbert Beck, Ludwig Zuern, Arndt Christian Caesar
  • Process for the manufacture of void-free polyolefin foam moldings
    Patent number: 3992501
    Abstract: Foam moldings of olefin polymers are prepared by heating, and pressing together, foamed particles of an olefin polymer, containing crosslinked constituents, in molds, a temperature gradient of from 0.5.degree. to 25.degree. C per cm of loose mass of particles being established in the mold, which has a gas-permeable wall on the lower-temperature side.
    Type: Grant
    Filed: June 18, 1974
    Date of Patent: November 16, 1976
    Assignee: BASF Aktiengesellschaft
    Inventors: Hermann Tatzel, Wolfram Koegel, Gilbert Beck, Ludwig Zuern, Arndt Christian Caesar