Patents by Inventor Nand K. Narain

Nand K. Narain 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).

  • Sulfur removal and comminution of carbonaceous material
    Patent number: 4775387
    Abstract: Finely divided, clean coal or other carbonaceous material is provided by forming a slurry of coarse coal in aqueous alkali solution and heating the slurry under pressure to above the critical conditions of steam. The supercritical fluid penetrates and is trapped in the porosity of the coal as it swells in a thermoplastic condition at elevated temperature. By a sudden, explosive release of pressure the coal is fractured into finely divided particles with release of sulfur-containing gases and minerals. The finely divided coal is recovered from the minerals for use as a clean coal product.
    Type: Grant
    Filed: October 7, 1987
    Date of Patent: October 4, 1988
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Nand K. Narain, John A. Ruether, Dennis N. Smith
  • Solvent treatment of coal for improved liquefaction
    Patent number: H69
    Abstract: Increased liquefaction yield is obtained by pretreating a slurry of solid carbonaceous material and a liquid hydrocarbonaceous solvent at a temperature above 200.degree. C. but below 350.degree. C. for a period of 10 minutes to four hours prior to exposure to liquefaction temperatures.
    Type: Grant
    Filed: November 6, 1985
    Date of Patent: June 3, 1986
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Herbert R. Appell, Nand K. Narain, Bruce R. Utz