Patents by Inventor Helmut Klotzsche

Helmut Klotzsche 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).

  • Complete drying method for hydrogels
    Patent number: 6641064
    Abstract: Hydrogel particles are produced by a drying step followed sequentially by precomminuting, grinding, separating, and further drying of coarse particles.
    Type: Grant
    Filed: April 25, 2001
    Date of Patent: November 4, 2003
    Assignee: BASF Aktiengesellschaft
    Inventors: Joachim Dentler, Norbert Herfert, Helmut Klotzsche, Rudolf Schliwa, Uwe Stüven
  • Low-dusting pulverulent hydrophilic polymers
    Patent number: 5681878
    Abstract: The present invention relates to pulverulent water-swellable hydrophilic (co)polymers which comprise, for reducing dusting, auxiliaries from the series consisting of silicones and/or other auxiliaries, the latter in a total amount of less than 1% by weight, for example polyglycols or polyglycol ethers, the vapor pressure of the individual auxiliaries being not more than 0.1 mbar at 20.degree. C. and their melting point being not more than 100.degree. C., processes for their preparation and their use for absorption of water and aqueous solutions.
    Type: Grant
    Filed: April 19, 1995
    Date of Patent: October 28, 1997
    Assignee: Cassella Aktiengesellschaft
    Inventors: Helmut Klotzsche, Gustav Remmel, Ulrich Riegel, Uwe Stuven
  • Hydrophilic highly swellable hydrogels
    Patent number: 5668236
    Abstract: The present invention relates to a hydrophilic highly swellable hydrogel based on (co)polymerized hydrophilic monomers or based on graft (co)polymers, characterized in that it is post-crosslinked with a polyamidoamine in an aqueous medium.
    Type: Grant
    Filed: April 29, 1996
    Date of Patent: September 16, 1997
    Assignee: Cassella Aktiengesellschaft
    Inventors: Fritz Engelhardt, Ulrich Riegel, Uwe Stuven, Helmut Klotzsche, Gustav Remmel