Patents by Inventor Hans P. Scherm

Hans P. Scherm 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 preparing highly dispersed metal oxides whose surfaces are modified by an ammonium-functional organopolysiloxane as a positive chargeable controlling agent for toners
    Patent number: 4902570
    Abstract: The invention relates to a process for preparing highly dispersed metal oxides whose surfaces are modified by an ammonium-functional organopolysiloxane as a charge controlling substance for positive chargeable toners, in which the highly dispersed metal oxides are reacted with an organopolysiloxane which contains silicon-bonded terminal hydroxyl and/or alkoxy groups, diorganosiloxane units, in which the two organic radicals are monovalent hydrocarbon radicals, and siloxane units in which the organic radicals contain a positive charged nitrogen which is bonded to silicon via carbon.
    Type: Grant
    Filed: March 4, 1988
    Date of Patent: February 20, 1990
    Assignee: Wacker-Chemie GmbH
    Inventors: Mario Heinemann, Johann Bindl, Johann Doppelberger, Hans P. Scherm