Patents by Inventor Norbert Nimmerfroh

Norbert Nimmerfroh 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).

  • Flotation process for mechanical pulp using a surface active agent
    Patent number: 5554258
    Abstract: An improved process for bleaching pulps is disclosed in which the unbleached pulp is subject to flotation before bleaching and, if necessary, the circulating water is also purified of interfering compounds by flotation.
    Type: Grant
    Filed: May 5, 1994
    Date of Patent: September 10, 1996
    Assignee: Degussa Aktiengesellschaft
    Inventors: Hans U. Suess, Norbert Nimmerfroh, Ralf Grimmer