Patents by Inventor Otto Hahmann

Otto Hahmann 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).

  • Random propylene copolymers for electric cable insulation
    Patent number: 4259410
    Abstract: As insulation for electric cables, there is provided an improved polyolefin having low shrinkage values, high elongation values, even after aging, the desired electrical insulation properties, and comprising partially crystalline, randomly copolymerized polypropylene having a proportion of ethylene, butene-1 and/or 1-hexene incorporated by polymerization of 1-6% by weight, a xylene-soluble proportion of 2-20% by weight, a viscosity value I of 200-400 cc./g., a melt flow index value (MFI.sub.190/5) of 1-20 g./10 min., and an elongation value of above 700%.
    Type: Grant
    Filed: April 6, 1978
    Date of Patent: March 31, 1981
    Assignee: Chemische Werke Huels Aktiengesellschaft
    Inventors: Walter Dittmann, Albert Frese, Otto Hahmann, Johannes Plenikowski, Helmut Klawitter
  • Heat sealable polybutene-1 blends containing polypropylene or ethylene copolymer
    Patent number: 4075290
    Abstract: Polymer blends comprising a major amount of polybutene-1 with a minor amount of low-pressure polypropylene or ethylene/propylene or butene-1 copolymers exhibit improved physical properties.
    Type: Grant
    Filed: July 12, 1973
    Date of Patent: February 21, 1978
    Assignee: Chemische Werke Huels Aktiengesellschaft
    Inventors: Horst Denzel, Otto Hahmann