Patents by Inventor Ananda Praturi

Ananda Praturi 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).

  • Fluidized bed silicon deposition from silane
    Patent number: 4444811
    Abstract: A process and apparatus for thermally decomposing silicon containing gas for deposition on fluidized nucleating silicon seed particles is disclosed.Silicon seed particles are produced in a secondary fluidized reactor by thermal decomposition of a silicon containing gas. The thermally produced silicon seed particles are then introduced into a primary fluidized bed reactor to form a fludized bed. Silicon containing gas is introduced into the primary reactor where it is thermally decomposed and deposited on the fluidized silicon seed particles. Silicon seed particles having the desired amount of thermally decomposed silicon product thereon are removed from the primary fluidized reactor as ultra pure silicon product.An apparatus for carrying out this process is also disclosed.
    Type: Grant
    Filed: December 3, 1981
    Date of Patent: April 24, 1984
    Assignee: California Institute of Technology
    Inventors: George Hsu, Harry Levin, Richard A. Hogle, Ananda Praturi, Ralph Lutwack
  • Fluidized bed silicon deposition from silane
    Patent number: 4314525
    Abstract: A process and apparatus for thermally decomposing silicon containing gas for deposition on fluidized nucleating silicon seed particles is disclosed.Silicon seed particles are produced in a secondary fluidized reactor by thermal decomposition of a silicon containing gas. The thermally produced silicon seed particles are then introduced into a primary fluidized bed reactor to form a fluidized bed. Silicon containing gas is introduced into the primary reactor where it is thermally decomposed and deposited on the fluidized silicon seed particles. Silicon seed particles having the desired amount of thermally decomposed silicon product thereon are removed from the primary fluidized reactor as ultra pure silicon product.An apparatus for carrying out this process is also disclosed.
    Type: Grant
    Filed: March 3, 1980
    Date of Patent: February 9, 1982
    Assignee: California Institute of Technology
    Inventors: George C. Hsu, Harry Levin, Richard A. Hogle, Ananda Praturi, Ralph Lutwack