Patents by Inventor Roeland Van Dael

Roeland Van Dael 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).

  • Continuous process for preparation of calcium thiosulfate liquid solution
    Patent number: 8454929
    Abstract: An efficient process for the continuous preparation of calcium thiosulfate (CaS2O3) from lime sulfur, through oxidation is described. The process involves oxidizing calcium polysulfide intermediate in a series of reactors to produce calcium thiosulfate as a clear liquid in high concentration with minimal byproducts. The process results in the complete destruction of polythionates, permitting the calcium thiosulfate produced to be useful in certain leaching processes for precious metals. The invention further makes it possible to recycle the process water from the leaching process for use as a raw material reactant in the process for calcium thiosulfate production.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: June 4, 2013
    Assignee: Tessenderlo Kerley, Inc.
    Inventors: Michael Massoud Hojjatie, Constance Lynn Frank Lockhart, Alexandros Dimitriadis, Jeroen Van Cauwenbergh, Roeland Van Dael
  • CONTINUOUS PROCESS FOR PREPARATION OF CALCIUM THIOSULFATE LIQUID SOLUTION
    Publication number: 20120031158
    Abstract: An efficient process for the continuous preparation of calcium thiosulfate (CaS2O3) from lime sulfur, through oxidation is described. The process involves oxidizing calcium polysulfide intermediate in a series of reactors to produce calcium thiosulfate as a clear liquid in high concentration with minimal byproducts. The process results in the complete destruction of polythionates, permitting the calcium thiosulfate produced to be useful in certain leaching processes for precious metals. The invention further makes it possible to recycle the process water from the leaching process for use as a raw material reactant in the process for calcium thiosulfate production.
    Type: Application
    Filed: August 16, 2011
    Publication date: February 9, 2012
    Applicant: TESSENDERLO KERLEY, INC.
    Inventors: Michael Massoud Hojjatie, Constance Lynn Frank Lockhart, Alexandros Dimitriadis, Jeroen Van Cauwenbergh, Roeland Van Dael