Patents by Inventor Hans-Peter Heisse

Hans-Peter Heisse 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 the production of rutile mixed-phase pigments
    Patent number: 4917735
    Abstract: A process for the production of rutile mixed-phase pigments comprising calcinating a solid mixture of titanium dioxide and/or titanium dioxide hydrate with a dye-producing metal compound in an indirectly heated rotary kiln supplied with air, wherein the titanium dioxide comprises an uncalcined, salt-free titanium dioxide having a specific BET surface of 50 to 500 m.sup.2 /g.
    Type: Grant
    Filed: January 18, 1989
    Date of Patent: April 17, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jakob Rademachers, Hans-Peter Heisse