Patents by Inventor Parameshwaran S. Sundar

Parameshwaran S. Sundar 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).

  • Patent number: 5347069
    Abstract: Disclosed is a process for treating oily wastes, which have a predominantly liquid phase, by mixing the oily waste with a granulating medium under turbulent flow conditions. The process comprises mixing the oily waste with a granulating medium under such conditions, wherein granules are formed having an attrition index of less than about 10 percent and a filtration index of greater than 0.20 gallons per minute per square foot. The contaminating hydrocarbons may then be removed by contacting the granules with a solvent capable of removing at least a portion of the contaminating hydrocarbons. The granules are then recovered by means known in the art.
    Type: Grant
    Filed: October 27, 1992
    Date of Patent: September 13, 1994
    Assignee: Chevron Research and Technology Company
    Inventor: Parameshwaran S. Sundar
  • Patent number: 4931161
    Abstract: A process is disclosed for removing hydrocarbons from oily wastes. According to the process, the oily wastes are mixed with solids and a binder and then granulated. The granules thus formed are contacted with solvent to extract hydrocarbons from the granules. Preferred solids include limestone and preferred binders include portland cement calcium sulfate and/or calcium sulfate hydrate such as plaster of Paris.
    Type: Grant
    Filed: July 12, 1989
    Date of Patent: June 5, 1990
    Assignee: Chevron Research Company
    Inventor: Parameshwaran S. Sundar
  • Patent number: 4323540
    Abstract: The precipitation of an iron complex is reduced during the stripping of uranium with ferrous ion, where the uranium was oxidized with nitric acid then extracted with an organic solvent. The reduction is accomplished by pre-stripping with sufficient ferrous ion to reduce nitrates and nitrites formed during the nitric acid oxidation. The amount of ferrous ion used in pre-stripping, however, is insufficient to precipitate uranium.
    Type: Grant
    Filed: January 23, 1980
    Date of Patent: April 6, 1982
    Assignee: Westinghouse Electric Corp.
    Inventor: Parameshwaran S. Sundar
  • Patent number: 4002716
    Abstract: Uranium is separated from analytical Group II and Group III metal ions in an aqueous liquor containing uranyl ions. The liquor is extracted with a non-interfering, water-immiscible, organic solvent containing a reagent which will react with the uranyl ions to form a complex soluble in the solvent. If the liquor is acidic, the solvent is washed with water. Then to the solvent is added an aqueous solution containing about 0.5 to 1.0 mole per liter of (NH.sub.4).sub.2 CO.sub.3 or NH.sub.4 HCO.sub.3 ions and sufficient sulfide ions to precipitate the metal ions as sulfides. The solvent and the aqueous solution are separated and the sulfides filtered from the aqueous solution. The ammonium-uranyl-tricarbonate in the aqueous solution can then be precipitated by increasing the concentration of (NH.sub.4).sub.2 CO.sub.3 or NH.sub.4 HCO.sub.3 ions to about 1.5 to 2.5 moles per liter. The precipitate is filtered and calcined to obtain U.sub.3 O.sub.8 or UO.sub.2.
    Type: Grant
    Filed: August 23, 1973
    Date of Patent: January 11, 1977
    Assignee: Westinghouse Electric Corporation
    Inventor: Parameshwaran S. Sundar
  • Patent number: 3966873
    Abstract: Uranium is separated from contaminating cations in an aqueous liquor containing uranyl ions. The liquor is mixed with sufficient recycled uranium complex to raise the weight ratio of uranium to said cations preferably to at least about three. The liquor is then extracted with at least enough non-interfering, water-immiscible, organic solvent to theoretically extract about all of the uranium in the liquor. The oganic solvent contains a reagent which reacts with the uranyl ions to form a complex soluble in the solvent. If the aqueous liquor is acidic, the organic solvent is then scrubbed with water. The organic solvent is stripped with a solution containing at least enough ammonium carbonate to pecipitate the uranium complex. A portion of the uranium complex is recycled and the remainder can be collected and calcined to produce U.sub.3 O.sub.8 or UO.sub.2.
    Type: Grant
    Filed: November 1, 1973
    Date of Patent: June 29, 1976
    Assignee: Westinghouse Electric Corporation
    Inventors: Leonard Elikan, Ward L. Lyon, Parameshwaran S. Sundar