Patents by Inventor Subhaschandra G. Malghan

Subhaschandra G. Malghan 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 obtaining high density green ceramics from powders
    Patent number: 5580832
    Abstract: A method of forming a highly dispersed ceramic powder slurry is provided prising forming an aqueous based slurry of a ceramic powder and a polyelectrolyte at an acidic pH and adjusting the pH of the slurry to an alkaline value.
    Type: Grant
    Filed: April 26, 1995
    Date of Patent: December 3, 1996
    Assignee: The United States of America as represented by the Secretary of Commerce
    Inventors: Subhaschandra G. Malghan, Ramannair S. Premachandran
  • Flotation of upper zone copper sulfide ores
    Patent number: 4585549
    Abstract: The present invention comprises a method of recovering copper minerals from ores containing both sulfide and oxidized copper sulfide minerals, such as found, for example, in surface oxidized porphyry ores. Accordingly, one embodiment of the present invention comprises first conditioning a pulp of an ore containing copper sulfide and oxidized copper sulfide minerals in the presence of an alkaline agent, next subjecting the so conditioned ore to a second conditioning step in the presence of a collector, subsequently adding a surface modifying agent to the so treated ore at a rate and in an amount sufficient to decrease the platinum electrode potential of the pulp when measured against a saturated calomel electrode to a minimum of -100 mV, then conditioning the ore only for a time sufficient to achieve intimate contact between the ore particles, and thereafter subjecting the so treated ore to conventional flotation.
    Type: Grant
    Filed: January 30, 1984
    Date of Patent: April 29, 1986
    Assignee: Exxon Research & Enginerring Company
    Inventor: Subhaschandra G. Malghan
  • Upgrading concentrates of paramagnetic sulfide minerals
    Patent number: 4545896
    Abstract: The present invention provides a process for separating a concentrate containing two or more minerals having substantially similar paramagnetic properties by treating the minerals particles with a dispersing agent so as to maintain the particles adequately dispersed during a subsequent magnetic separation step. Thus, in one embodiment of the present invention a method is provided for separating sulfide concentrate into at least two fractions. The process comprises obtaining a slurry of the sulfide minerals particles, adding a dispersing agent to the slurry so as to maintain the particles in the slurry dispersed during a subsequent magnetic separation step and thereafter passing the so dispersed particle slurry to a high gradient magnetic field whereby the more magnetic particles are retained within the field and the less magnetic particles pass therethrough thereby affecting separation.
    Type: Grant
    Filed: March 26, 1984
    Date of Patent: October 8, 1985
    Assignee: Exxon Research and Engineering Co.
    Inventor: Subhaschandra G. Malghan