Patents by Inventor Jan P. van't Sant

Jan P. van't Sant 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).

  • Process for the removal of arsenic compounds from tungsten or molybdenum concentrates
    Patent number: 4457776
    Abstract: A process for the removal of arsenic compounds from tungsten and/or molybdenum concentrates by selective extraction, characterized in that the concentrates are extracted with an aqueous solution of a ferric compound of a pH below 2.5 and a temperature of at least 60.degree. C.
    Type: Grant
    Filed: August 2, 1983
    Date of Patent: July 3, 1984
    Assignee: Shell Internationale Research Maatschappij B.V.
    Inventors: Jan P. Van't Sant, Arjen Nieuwhof
  • Process for the removal of arsenic compounds from tungsten or molybdenum concentrates
    Patent number: 4420331
    Abstract: A process for the removal of arsenic compounds from tungsten and/or molybdenum concentrates by selective extraction, characterized in that the concentrates are extracted with an aqueous solution of a ferric compound at a pH below 2.5 and a temperature of at least 60.degree. C.
    Type: Grant
    Filed: January 21, 1982
    Date of Patent: December 13, 1983
    Assignee: Shell Internationale Research Maatschappij B.V.
    Inventors: Jan P. van't Sant, Arjen Nieuwhof