Patents by Inventor Ernst Koehnlein

Ernst Koehnlein 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).

  • Electric cables which contain insulations based on ethylene polymers having high resistance to the formation of water trees
    Patent number: 5283120
    Abstract: An electric cable contains a cable insulation having high resistance to the formation or growth of water trees and having high aging resistance and good processibility and consisting of an ethylene polymer and from 0.5 to 40% by weight of an ethylene copolymer ionomer which contains, in addition to predominant amounts of ethylene, a C.sub.3 -C.sub.6 -alkenecarboxylic acid or a C.sub.4 -C.sub.6 -alkenedicarboxylic acid or -dicarboxylic anhydride as copolymerized units, some of the carboxyl groups or carboxylic anhydride groups having been converted into ammonium salts of tertiary amines.
    Type: Grant
    Filed: August 30, 1989
    Date of Patent: February 1, 1994
    Inventors: Ernst Koehnlein, Heinz Vogt, Johannes Schlag, Thomas Muehlenbernd, Hans-Henning Hub
  • Cable insulation based on ethylene polymers having high resistance to the formation of water trees
    Patent number: 5047482
    Abstract: Cable insulation having high resistance to the formation or growth of water trees and high aging resistance consists of an ethylene polymer (I) and from 0.5 to 20% by weight of an ethylene polymer (II), which is an ethylene/C.sub.1 -C.sub.8 -alkyl-C.sub.3 -C.sub.6 -alkene carboxylate/C.sub.3 -C.sub.6 -alkenecarboxylic acid terpolymer.
    Type: Grant
    Filed: March 5, 1987
    Date of Patent: September 10, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: Johannes Schlag, Ernst Koehnlein, Peter Bauer, Ludwig Koessler
  • Electric cables which contain insulations based on ethylene polymers having high resistance to the formation of water trees
    Patent number: 4997713
    Abstract: In an electric high voltage cable of 1-500 kV, the cable insulation is resistant to the formulation or the growth of water trees and consists of from 70 to 99 parts by weight of an ethylene polymer (I) and from 1 to 30 parts by weight of an ethylene copolymer (II) which is composed of from 80 to 92% by weight of ethylene and from 8 to 20% by weight of a C.sub.4 -C.sub.10 -.alpha.-olefin having a density of from 0.890 to 0.915 g/cm.sup.3 and a crystallite melting point of from 90.degree. to 125.degree. C.
    Type: Grant
    Filed: May 10, 1989
    Date of Patent: March 5, 1991
    Inventors: Ernst Koehnlein, Johannes Schlag, Heinz Vogt, Peter Bauer, Alfred F. Hauss
  • Cable insulation based on ethylene polymers having high resistance to the formation of water trees
    Patent number: 4876147
    Abstract: Cable insulation having high resistance to the formation or growth of water trees and high aging resistance consists of an ethylene polymer and from 0.5 to 20 percent by weight of a styrene copolymer, which is a styrene/diene copolymer in which not less than 90% of the olefinic double bonds have been hydrogenated.
    Type: Grant
    Filed: March 5, 1987
    Date of Patent: October 24, 1989
    Assignee: BASF Aktiengesellschaft
    Inventors: Johannes Schlag, Ernst Koehnlein, Peter Bauer, Ludwig Koessler, Alfred F. Hausz
  • Electrical insulating compositions based on ethylene/vinyl acetate copolymers
    Patent number: 4124655
    Abstract: Electrical insulating compositions consisting of an ethylene/vinyl acetate copolymer containing from 0.5 to 9.5 percent by weight of vinyl acetate units, from 0.1 to 2.0 percent by weight of polymerized 2,2,4-trimethyl-1,2-dihydroquinoline, from 0.5 to 5 percent by weight of a triallyl cyanurate and, optionally, up to 0.1 percent by weight of sulfur. The compositions can be crosslinked, with high yield, by treatment with high energy radiation.
    Type: Grant
    Filed: January 11, 1977
    Date of Patent: November 7, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Ernst Koehnlein, Rudolf Glaser, Ludwig Koessler