Patents by Inventor Manher M. Makwana

Manher M. Makwana 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).

  • Purification of elemental sulphur
    Patent number: 5711929
    Abstract: A process for removing mercury from elemental sulphur contaminated therewith by liquid-liquid contact by mixing of the contaminated elemental sulphur in a molten state with an aqueous solution containing sulphide and polysulphide anions for extraction of the mercury contaminant from the elemental sulphur into the aqueous sulphide solution, and separating the aqueous sulphide solution containing mercury contaminant from the molten elemental sulphur to provide an elemental sulphur product substantially free from mercury.
    Type: Grant
    Filed: April 3, 1995
    Date of Patent: January 27, 1998
    Assignee: 698638 Alberta Ltd.
    Inventors: Michael E. Chalkley, Michael J. Collins, Manher M. Makwana, Ian M. Masters, John Stiksma
  • Purification of elemental sulphur
    Patent number: 5403571
    Abstract: A process for removing mercury or other metal impurities from elemental sulphur contaminated therewith includes mixing such elemental sulphur in a molten state with an aqueous sulphide solution or an aqueous solution of sufficiently high pH which reacts with elemental sulphur and forms a sulphide solution to cause extraction of mercury or other metal contaminants from the elemental sulphur into the aqueous sulphide solutions, and separating the aqueous sulphide solution containing mercury or other metal contaminants from the molten elemental sulphur to provide an elemental sulphur product substantially free from mercury and other metal contaminants.
    Type: Grant
    Filed: April 4, 1991
    Date of Patent: April 4, 1995
    Assignee: Sherritt Gordon Limited
    Inventors: Michael E Chalkley, Michael J. Collins, Manher M. Makwana, Ian M. Masters