Patents by Inventor Jan STEMANN

Jan STEMANN 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).

  • Production of citrate soluble phosphates by calcination of secondary phosphate sources with a sodium-sulfuric compound
    Patent number: 10259752
    Abstract: A method of calcination includes providing a raw material including whitlockite Ca9(Mg,Fe2+)[PO3(OH)|(PO4)6], and/or iron phosphate FePO4, and/or aluminum phosphate AlPO4 and/or fluorapatite Ca5(PO4)3F; providing an alkaline-sulfuric compound as an additive; and calcining a mixture of the raw material with the additive to obtain a product, including a citrate soluble phosphate compound.
    Type: Grant
    Filed: June 11, 2015
    Date of Patent: April 16, 2019
    Assignees: OUTOTEC (FINLAND) OY, BUNDESREPUBLIK DEUTSCHLAND, VERTRETEN DURCH DAS BUNDESMINSITERIUM FÜR WIRTSCHAFT UND ENERGIE, DIESES VERTRETEN DURCH DEN PRÄSIDENTEN DER BAM, BUNDESANSTALT FÜR MATERIALFORSCHUNG UND -PRÜFUNG
    Inventors: Jan Stemann, Christian Adam, Ludwig Hermann
  • PRODUCTION OF CITRATE SOLUBLE PHOSPHATES BY CALCINATION OF SECONDARY PHOSPHATE SOURCES WITH A SODIUM-SULFURIC COMPOUND
    Publication number: 20180244587
    Abstract: A method of calcination includes providing a raw material including whitlockite Ca9(Mg,Fe2+)[PO3(OH)|(PO4)6], and/or iron phosphate FePO4, and/or aluminium phosphate AlPO4 and/or fluorapatite Ca5(PO4)3F; providing an alkaline-sulfuric compound as an additive; and calcining a mixture of the raw material with the additive to obtain a product, including a citrate soluble phosphate compound.
    Type: Application
    Filed: June 11, 2015
    Publication date: August 30, 2018
    Inventors: Jan STEMANN, Dr. Christian ADAM, Ludwig HERMANN