Patents by Inventor George Demopoulos

George Demopoulos 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 producing scorodite
    Patent number: 12252412
    Abstract: This invention relates to safe immobilization and disposal of arsenic found in industrial waste streams and residues in the form of clean and compact well grown scorodite solids.
    Type: Grant
    Filed: May 25, 2020
    Date of Patent: March 18, 2025
    Assignee: THE ROYAL INSTITUTION FOR THE ADVANCEMENT OF LEARNING/MCGILL UNIVERSITY
    Inventor: George Demopoulos
  • Layered and spinel lithium titanates and processes for preparing the same
    Patent number: 9825292
    Abstract: A process for producing lithium titanate which includes the steps of synthesizing a lithium titanate hydrate intermediate via aqueous chemical processing, and thermally treating the lithium titanate hydrate intermediate to produce the lithium titanate. The lithium titanate hydrate is preferably (Li1.81H0.19)Ti2O<<2H2O. The lithium titanate is preferably Li4Ti5O12 (LTO). Synthesizing the lithium titanate hydrate intermediate may include mixing a titanium-containing compound with a lithium-containing compound in a solvent to produce a lithium-titanium precursor mixture. Preferably the titanium-containing compound includes titanium tetrachloride TiCl4. Also, a lithium titanate obtained according to the process and a lithium battery including the lithium titanate.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: November 21, 2017
    Assignees: HYDRO-QUEBEC, MCGILL UNIVERSITY
    Inventors: George Demopoulos, Hsien-Chieh Chiu, Karim Zaghib, Abdelbast Guerfi
  • Production of high strength hydrochloric acid from calcium chloride feed streams by crystallization
    Patent number: 9783428
    Abstract: The present relates to a method for producing calcium sulfate solid crystals and hydrochloric acid (HCl) from a calcium chloride solution comprising the steps of feeding a continuous stirred-tank reactor with a calcium chloride solution, sulfuric acid and water; mixing the calcium chloride solution, sulfuric acid and water in the reactor; and maintaining the reactor a temperature of less than about 70° C., converting the calcium chloride solution, sulfuric acid and water into HCl and calcium sulfate solid crystals. The method described herein can be incorporated as a means for regenerating HCl from CaCl2 solutions which are generated in the metallurgical industry when processing calcium-bearing ores for recovering metals like rare earth elements.
    Type: Grant
    Filed: April 6, 2016
    Date of Patent: October 10, 2017
    Assignee: THE ROYAL INSTITUTION FOR THE ADVANCEMENT OF LEARNING/MCGILL UNIVERISITY
    Inventors: George Demopoulos, Thomas Feldmann
  • LAYERED AND SPINEL LITHIUM TITANATES AND PROCESSES FOR PREPARING THE SAME
    Publication number: 20150236345
    Abstract: A process for producing lithium titanate which includes the steps of synthesizing a lithium titanate hydrate intermediate via aqueous chemical processing, and thermally treating the lithium titanate hydrate intermediate to produce the lithium titanate. The lithium titanate hydrate is preferably (Li1.81H0.19)Ti2O<<2H2O. The lithium titanate is preferably Li4Ti5O12 (LTO). Synthesizing the lithium titanate hydrate intermediate may include mixing a titanium-containing compound with a lithium-containing compound in a solvent to produce a lithium-titanium precursor mixture. Preferably the titanium-containing compound includes titanium tetrachloride TiCl4. Also, a lithium titanate obtained according to the process and a lithium battery including the lithium titanate.
    Type: Application
    Filed: October 10, 2013
    Publication date: August 20, 2015
    Applicants: MCGILL UNIVERSITY, HYDRO-QUEBEC
    Inventors: George Demopoulos, Hsien-Chieh Chiu, Karim Zaghib, Abdelbast Guerfi