Patents by Inventor Wilhelm Berndt

Wilhelm Berndt 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 bleaching cellulose with organic peracid
    Patent number: 4400237
    Abstract: Cellulose is bleached by means of an organic peracid in the acid region and subsequently by means of peroxide in the alkaline region. As peracid there is employed an acid which is produced from the corresponding carboxylic acid by reaction with hydrogen peroxide in the presence of a mineral acid. The peroxide bleaching step which follows the peracid bleaching step is carried out after there is added the necessary amount of aqueous alkali solution for carrying out the peroxide bleaching step of the pulp without intermediate washing of the cellulose. A further addition of peroxide is not carried out.
    Type: Grant
    Filed: February 6, 1981
    Date of Patent: August 23, 1983
    Assignee: Degussa Aktiengesellschaft
    Inventors: Horst Kruger, Wilhelm Berndt, Hans U. Suss
  • Process for the production of water containing carbon black preparations
    Patent number: 4366139
    Abstract: Beaded carbon black is disclosed with a water content of 30 to 80% by weight which are used for coloring of paper and concrete. The product has the advantage of dust-free handling and a higher jet black color compared to conventional carbon black powder.
    Type: Grant
    Filed: February 28, 1980
    Date of Patent: December 28, 1982
    Assignee: Degussa Aktiengesellschaft
    Inventors: Gerhard Kuhner, Wilhelm Berndt, Lothar Rothbuhr, Hans Wagner
  • Production of paper pulp from sugar mill bagasse
    Patent number: 4260452
    Abstract: Paper pulp is produced by a process in which raw sugar mill bagasse is moist depithed, wet bulk stored in the presence of an inorganic and organic preservative, wet depithed by hydraulic shearing in the presence of an inorganic color remover, pulped, washed, cleaned and dewatered.
    Type: Grant
    Filed: November 24, 1978
    Date of Patent: April 7, 1981
    Inventors: Horst Kruger, Wilhelm Berndt, Ursula Schwartzkopff, Franz J. Reitter, Theodor Hopner, Hans-Joachim Muhlig