Patents by Inventor Thinnalur J. Sivakumar

Thinnalur J. Sivakumar 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).

  • Boehmite production by precipitation from sodium aluminate solution at elevated temperatures
    Patent number: 4595581
    Abstract: Substantially pure boehmite is produced by heating an aqueous sodium aluminate solution to a temperature of about 115.degree.-145.degree. C., preferably about 120.degree.-130.degree. C., treating the heated solution with alumina seed material and separating a boehmite precipitate from the solution. A particularly preferred seed material is boehmite gel.
    Type: Grant
    Filed: June 5, 1985
    Date of Patent: June 17, 1986
    Assignee: Aluminum Company of America
    Inventors: Chanakya Misra, Thinnalur J. Sivakumar
  • Lowering organic contaminant content in a sodium aluminate solution by oxidation in a packed bed
    Patent number: 4581208
    Abstract: Wet oxidation of organic contaminants in aqueous sodium aluminate solutions is enhanced when a heated and oxygenated solution is passed through a packed bed containing a metal packing member that is chemically inert to sodium aluminate solutions at elevated temperatures. Process temperature is about 180.degree.-300.degree. C. and oxygen partial pressure is at least about 345 kPa. The packed bed has a packing surface of at least 100 square meters per cubic meter bed volume and preferably at least 50% free space.
    Type: Grant
    Filed: June 26, 1985
    Date of Patent: April 8, 1986
    Assignee: Aluminum Company of America
    Inventors: Paul J. The, Fred S. Williams, Thinnalur J. Sivakumar