Patents by Inventor David Wohlgemuth

David Wohlgemuth 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 for obtaining cesium from aqueous starting solutions
    Patent number: 11155895
    Abstract: The disclosed subject matter relates to a method for obtaining cesium from aqueous solutions.
    Type: Grant
    Filed: July 9, 2018
    Date of Patent: October 26, 2021
    Assignee: Albemarle Germany GmbH
    Inventors: Rainer Dietz, Johannes Willems, David Wohlgemuth, Henrike Rempel
  • Method for the hydrometallurgical recovery of lithium from the lithium manganese oxide-containing fraction of used galvanic cells
    Patent number: 10711326
    Abstract: The invention relates to a method for the hydrometallurgical recovery of lithium from the lithium manganese oxide-containing fraction of used galvanic cells.
    Type: Grant
    Filed: October 9, 2013
    Date of Patent: July 14, 2020
    Assignee: Albemarle Germany GmbH
    Inventors: David Wohlgemuth, Mark Andre Schneider, Rebecca Spielau, Johannes Willems, Martin Steinbild, Norbert Kliehm
  • Method For Obtaining Caesium From Aqueous Starting Solutions
    Publication number: 20200208239
    Abstract: The invention relates to a method for obtaining caesium from aqueous starting solutions having caesium contents in the range of 50 ppm to 5000 ppm, in which method the caesium ions in the aqueous solution are, in a first step, precipitated as a double salt having divalent cations with the aid of an at least 1.1-times overstoichiometric amount of solutions containing prussiate of potash, in a pH range of 2 to 12 and a temperature range of 10 to 80° C., the divalent cations either already being present in the starting solutions in an amount at least equimolar to the caesium content or being added as a water-soluble salt, and, in a second step, converted back into a water-soluble form by thermal decomposition and, in a third step, separated from the insoluble residues.
    Type: Application
    Filed: July 9, 2018
    Publication date: July 2, 2020
    Inventors: Rainer Dietz, Johannes Willems, David Wohlgemuth, Henrike Rempel
  • Method for the hydrometallurgical recovery of lithium, nickel and cobalt from the lithium transition metal oxide-containing fraction of used galvanic cells
    Patent number: 9702024
    Abstract: A method for the hydrometallurgical recovery of lithium from a lithium transition metal oxide containing fraction of used galvanic cells is disclosed. According to the method, the lithium transition metal oxide containing fraction is introduced into sulphuric acid or hydrochloric acid, and hydrogen peroxide is added in an amount that is at least stoichiometric relative to the transition metal content to be reduced of the lithium transition metal oxide-containing fraction.
    Type: Grant
    Filed: October 9, 2013
    Date of Patent: July 11, 2017
    Assignee: Rockwood Lithium GmbH
    Inventors: David Wohlgemuth, Mark Andre Schneider, Rebecca Spielau, Johannes Willems, Martin Steinbild
  • Method for the hydrometallurgical recovery of lithium from the fraction of used galvanic cells containing lithium, iron and phosphate
    Patent number: 9677153
    Abstract: A method for the hydrometallurgical recovery of lithium from the fraction of used galvanic cells containing lithium, iron and phosphate is disclosed. According to the method, lithium-iron-phosphate-containing fraction is introduced into sulfuric acid and/or hydrochloric acid, and hydrogen peroxide is added in an amount that is at least stoichiometric relative to the iron content to be oxidized of the lithium-iron-phosphate-containing fraction.
    Type: Grant
    Filed: October 9, 2013
    Date of Patent: June 13, 2017
    Assignee: Rockwood Lithium GmbH
    Inventors: David Wohlgemuth, Mark Andre Schneider, Rebecca Spielau, Johannes Willems, Martin Steinbild
  • METHOD FOR THE HYDROMETALLURGICAL RECOVERY OF LITHIUM FROM THE FRACTION OF USED GALVANIC CELLS CONTAINING LITHIUM, IRON AND PHOSPHATE
    Publication number: 20150267277
    Abstract: A method for the hydrometallurgical recovery of lithium from the fraction of used galvanic cells containing lithium, iron and phosphate.
    Type: Application
    Filed: October 9, 2013
    Publication date: September 24, 2015
    Inventors: David Wohlgemuth, Mark Andre Schneider, Rebecca Spielau, Johannes Willems, Martin Steinbild
  • METHOD FOR THE HYDROMETALLURGICAL RECOVERY OF LITHIUM FROM THE LITHIUM MANGANESE OXIDE-CONTAINING FRACTION OF USED GALVANIC CELLS
    Publication number: 20150267278
    Abstract: The invention relates to a method for the hydrometallurgical recovery of lithium from the lithium manganese oxide-containing fraction of used galvanic cells.
    Type: Application
    Filed: October 9, 2013
    Publication date: September 24, 2015
    Inventors: David Wohlgemuth, Mark Andre Scheider, Rebecca Spielau, Johannes Willems, Martin Steinbild, Norbert Kliehm
  • METHOD FOR THE HYDROMETALLURGICAL RECOVERY OF LITHIUM, NICKEL AND COBALT FROM THE LITHIUM TRANSITION METAL OXIDE-CONTAINING FRACTION OF USED GALVANIC CELLS
    Publication number: 20150247216
    Abstract: A method for the hydrometallurgical recovery of lithium from a lithium transition metal oxide-containing fraction of used galvanic cells.
    Type: Application
    Filed: October 9, 2013
    Publication date: September 3, 2015
    Inventors: David Wohlgemuth, Mark Andre Schneider, Rebecca Spielau, Johannes Willems, Martin Steinbild