Patents by Inventor Egbert Hoffmann

Egbert Hoffmann 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 separation of solids from phosphoric acid
    Patent number: 4343780
    Abstract: A process is disclosed separating solids from phosphoric acid produced by the wet process. This is accomplished by relatively simple means but with a high degree of efficiency with reference to the P.sub.2 O.sub.5 content of the phosphoric acid product.
    Type: Grant
    Filed: January 27, 1981
    Date of Patent: August 10, 1982
    Assignee: UHDE GmbH
    Inventors: Friedrich Wolstein, Egbert Hoffmann, Wolfgang Epper
  • Method for the treatment of phosphate rock
    Patent number: 4181703
    Abstract: The method for the treatment of phosphate rock that has a content of magnesium compounds in excess of 0.3%. The crushed and screened phosphate rock is mixed with water in a ratio of 1:5 by weight. The mixture is acidified with sulphuric acid, and the reaction mixture is filtered and washed before the neutralization point is reached.
    Type: Grant
    Filed: November 18, 1977
    Date of Patent: January 1, 1980
    Assignee: UHDE GmbH
    Inventors: Wilhelm Wengeler, Friedrich Wolstein, Egbert Hoffmann
  • Process for reducing the grain size of phosphate rock
    Patent number: 4116390
    Abstract: Freshly mined phosphate rock is subjected to screen classification in at least two stages. Only coarse grained phosphate rock with a grain size over 2 mm from the last screen classification step is fed to a plain-roller grinding mill. The rollers of the grinding mill run at different peripheral speeds, so that the grains are ground by radial and tangential forces. This produces a fine grained phosphate rock whose natural moisture content is advantageous when further processed to phosphoric acid by means of sulphuric acid.
    Type: Grant
    Filed: April 4, 1977
    Date of Patent: September 26, 1978
    Assignee: Uhde GmbH
    Inventors: Wilhelm Wengeler, Egbert Hoffmann