Patents by Inventor Klaus Steigerwald

Klaus Steigerwald 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).

  • Multi-stage isolation of high pressure polyethylene
    Patent number: 4087602
    Abstract: A process for the manufacture of ethylene polymers by homopolymerization and copolymerization of ethylene at pressures of from 500 to 5,000 bars and at from 50.degree. to 450.degree. C, with subsequent isolation of the polymers in high pressure product isolation zones and low pressure product isolation zones. The various parallel product isolation zones are at different temperatures, and the mean product residence times in the zones may be identical or different. Very different products, in amounts which can be chosen according to requirements, and with mutually independent polymer properties, can be obtained using only one high pressure polymerization system.
    Type: Grant
    Filed: May 19, 1976
    Date of Patent: May 2, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz Georg Mietzner, Oskar Buechner, Klaus Steigerwald, Gottfried Schlichthaerle, Friedrich Urban
  • Production of mixtures of plastics materials
    Patent number: 3937772
    Abstract: Production of a homogeneous mixture of plastics materials in powder form by subjecting a molten inhomogeneous mixture of two or more plastics to a maximum shear velocity of from 10.sup.4 to 10.sup.8 sec.sup.-.sup.1 for from 10.sup..sup.-2 to 10.sup..sup.-6 seconds; the pulverulent mixtures obtained are used in rotary sintering and injection molding.
    Type: Grant
    Filed: June 9, 1971
    Date of Patent: February 10, 1976
    Assignee: Badische Anilin- & Soda-Fabrik Aktiengesellschaft
    Inventors: Friedrich Urban, Oskar Buechner, Klaus Steigerwald, Karl-Heinz Fauth, Heinz Gehrig