Patents by Inventor Andreas Stubbe

Andreas Stubbe 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).

  • Toner containing pigment and surface modified pyrogenically produced aluminum oxide
    Patent number: 5501933
    Abstract: Disclosed is an electrophotographic toner comprising a resin, a pigment, and surface-modified, pyrogenically produced aluminum oxide which is has the following physico-chemical properties:______________________________________ Surface (m.sup.2 /g) 50 to 100 Stamping density (g/l) 50 to 90 Drying loss (%) <5 Annealing loss (%) 5.0 to 15 C content (%) 0.5 to 12 pH 4 to 8.
    Type: Grant
    Filed: May 19, 1994
    Date of Patent: March 26, 1996
    Assignee: Degussa Aktiengesellschaft
    Inventors: Hans Deusser, Dieter Kerner, Ju/ rgen Meyer, Gu/ nther Michael, Andreas Stubbe
  • Surface-modified silicon dioxides
    Patent number: 5429873
    Abstract: Surface-modified, pyrogenically produced silicon dioxide is obtained by placing a pyrogenically produced silicon dioxide in a know mixing device, spraying it with a chemical compound from the group:CHF.sub.2 --CF.sub.2 --O--(CH.sub.2).sub.3 --Si(OCH.sub.3).sub.3CF.sub.3 --CHF--CF.sub.2 --O--(CH.sub.2).sub.3 --Si(OCH.sub.3).sub.3C.sub.4 F.sub.9 --CH.sub.2 --CH.sub.2 --Si(OCH.sub.3).sub.3C.sub.6 F.sub.13 --CH.sub.2 --CH.sub.2 --Si(OCH.sub.3).sub.3with intensive mixing, subsequently mixing it and tempering the mixture obtained for a fairly long time.
    Type: Grant
    Filed: October 7, 1992
    Date of Patent: July 4, 1995
    Assignee: Degussa Aktiengesellschaft
    Inventors: Hans Deusser, Thomas Gobel, Jurgen Meyer, Michael Gunther, Andreas Stubbe
  • Surface-modified pyrogenically produced aluminum oxide
    Patent number: 5419928
    Abstract: Surface-modified, pyrogenically produced aluminum oxide which is has the following physico-chemical properties:______________________________________ Surface (m.sup.2 /g) 50 to 150 Stamping density (g/l) 50 to 90 Drying loss (%) <5 Annealing loss (%) 5.0 to 15 C content (%) 0.5 to 12 pH 4 to 8.
    Type: Grant
    Filed: October 26, 1993
    Date of Patent: May 30, 1995
    Assignee: Degussa Aktiengesellschaft
    Inventors: Hans Deusser, Dieter Kerner, Jurgen Meyer, Gunther Michael, Andreas Stubbe
  • Surface-modified pyrogenically produced titanium dioxide
    Patent number: 5415936
    Abstract: Surface-modified, pyrogenically produced titanium dioxide which has the following physico-chemical properties:______________________________________ Surface (m.sup.2 /g) 5 to 120 Stamping density (g/l) 50 to 250 Drying loss (%) <5 Annealing loss (%) 3.5 to 15 Carbon content (%) 0.5 to 12 pH 4 to 10.
    Type: Grant
    Filed: January 28, 1993
    Date of Patent: May 16, 1995
    Assignee: Degussa Aktiengesellschaft
    Inventors: Hans Deusser, Dieter Kerner, Jurgen Meyer, Gunther Michael, Andreas Stubbe
  • Surface-modified pyrogenically produced aluminum oxide
    Patent number: 5384194
    Abstract: Surface-modified, pyrogenically produced aluminum oxide which has the following physico-chemical properties:______________________________________ Surface (m.sup.2 /g) 50 to 150 Stamping density (g/l) 50 to 90 Drying loss (%) <5 Annealing loss (%) 5.0 to 15 C content (%) 0.5 to 12 pH 4 to 8.
    Type: Grant
    Filed: January 28, 1993
    Date of Patent: January 24, 1995
    Assignee: DeGussa Aktiengesellschaft
    Inventors: Hans Deusser, Dieter Kerner, Jurgen Meyer, Gunther Michael, Andreas Stubbe
  • Surface-modified pyrogenically produced titanium dioxide
    Patent number: 5372905
    Abstract: Surface-modified, pyrogenically produced titanium dioxide which is has the following physico-chemical properties:______________________________________ Surface (m.sup.2 /g) 5 to 120 Stamping density (g/l) 50 to 250 Drying loss (%) <5 Annealing loss (%) 3.5 to 15 Carbon content (%) 0.5 to 12 pH 4 to 10.
    Type: Grant
    Filed: October 26, 1993
    Date of Patent: December 13, 1994
    Assignee: Degussa Aktiengesellschaft
    Inventors: Hans Deusser, Dieter Kerner, Jurgen Meyer, Gunther Michael, Andreas Stubbe