Patents by Inventor Heinrich J. Schroeder

Heinrich J. Schroeder 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).

  • Method of recovering boric acid from waste-water concentrates of nuclear plants
    Patent number: 4435184
    Abstract: A waste-water concentrate containing boric acid together with chemical residues and radionuclides, especially from a nuclear power plant, is treated to recovering boric acid which can be recycled to the plant. According to the invention, the practically neutral solution is acidified with an acid selected from the group which consists of sulfuric acid, hydrochloric acid, nitric acid and acetic acid to precipitate the boric acid which is separated from the concentrate and subjected to at least one recrystallization step. The boric acid thus obtained is of comparatively high purity.
    Type: Grant
    Filed: April 30, 1981
    Date of Patent: March 6, 1984
    Assignee: Rheinisch-Westfalisches Elektrizitatswerk AG
    Inventors: Heinrich J. Schroeder, Rainer Ambros, Gottfried Paffrath, Norbert Brenner