Patents by Inventor Karl Hurm

Karl Hurm 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 separating and recovering residual monomers from aqueous suspensions of acrylonitrile polymers
    Patent number: 3980529
    Abstract: The invention relates to a process for the recovery of acrylonitrile and other monomers from an aqueous polymer dispersion by continuous distillation in a thin-layer evaporator under reduced pressure, condensation of the evaporated monomers in a condenser under the same or similar reduced pressure and subsequent condensation or absorption respectively of the monomer vapors which have not been condensed in the condenser at a higher pressure.
    Type: Grant
    Filed: April 21, 1975
    Date of Patent: September 14, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gerd Wilhelm, Karl Hurm, Rolf-Burkhard Hirsch, Artur Jaschke, Herbert Marzolph
  • Acrylonitrile-vinylidene chloride copolymers and a process for the production thereof
    Patent number: 3974130
    Abstract: This invention relates to copolymers of acrylonitrile and vinylidene chloride containing at least 55 % by weight of acrylonitrile and at most 45 % by weight of vinylidene chloride of the kind used for the production of substantially non-flammable textile filaments, which copolymers are distinguished by their outstanding whiteness and high softening temperatures which enable homogeneous spinning solutions particularly suitable for spinning to be prepared. This invention also relates to a process for the production of these copolymers.
    Type: Grant
    Filed: March 27, 1974
    Date of Patent: August 10, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Karl Hurm, Wolfhard Schmidt