Patents by Inventor Hans U. Suess

Hans U. Suess 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
  • Process for increasing pulp brightness with zeolites and easily decomposable organic chelating agents
    Patent number: 5227022
    Abstract: A process is disclosed for bleaching wood pulp, cellulose or used paper by treatment the fibre material to be bleached before the bleaching steps with a natural or synthetic zeolite or a layer lattice silicate and an easily decomposable organic complex forming agent, e.g. citric acid.
    Type: Grant
    Filed: May 19, 1992
    Date of Patent: July 13, 1993
    Assignee: Degussa Aktiengesellschaft
    Inventors: Wolfgang Leonhardt, Kurt Schmidt, Hans U. Suess, Holger Glaum
  • Process for stabilization of the viscosity of wood pulps
    Patent number: 5073301
    Abstract: A process is described in which, by the addition of formamidinesulfinic acid in association with an ozone or ozone/oxygen treatment, the viscosity and strength of wood pulps are stabilized at the level that is obtained with use of conventional, chlorine-containing bleaching processes.
    Type: Grant
    Filed: July 12, 1990
    Date of Patent: December 17, 1991
    Assignee: Degussa Aktiengesellschaft
    Inventors: Hans U. Suess, Wilfried Eul