Patents by Inventor Wolfgang Korschen

Wolfgang Korschen 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).

  • Magnetic iron oxide, process for its production and the use thereof
    Patent number: 6143194
    Abstract: The invention relates to magnetite particles having an iron content of 45 to 73 wt. %, a process for their production and their use for the production of toners, printing inks and inks for ink jet printers.
    Type: Grant
    Filed: October 7, 1997
    Date of Patent: November 7, 2000
    Assignee: Bayer AG
    Inventors: Wolfgang Korschen, Ulrich Meisen
  • Use of free-flowing, magnetic iron oxide containing granules with 50 to 73 wt. % iron content
    Patent number: 6063180
    Abstract: Magnetic iron oxide-containing granules for producing toners or inks, the granules comprising 95.0 to 99.8 wt. % of a magnetic iron oxide-containing compound and 0.2 to 5.0 wt. % of a binder, wherein the magnetic iron oxide-containing compound has an iron content of 50 to 73 wt. %, and wherein the granules have the following properties: a lightness under brightening L* of 40 to 79 CIELAB units, a color cast a* of -1.0 to 4.0 CIELAB units, a color cast b* of 0.0 to -7.0 CIELAB units, an average particle size of 30 to 250 .mu.m, and a residue of less than 2 wt. % in a flow properties test having a 1 mm sieve and 400 strokes.
    Type: Grant
    Filed: June 9, 1998
    Date of Patent: May 16, 2000
    Assignee: Bayer AG
    Inventors: Wolfgang Korschen, Ulrich Meisen