Patents by Inventor Hitendra Ghosh

Hitendra Ghosh 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 of controlling oxygen content and distribution in grown silicon crystals
    Patent number: 4511428
    Abstract: An improved method of growing silicon crystals by the Czochralski method to obtain a desired oxygen concentration level with both axial and radial uniformity. A crucible is located within a heater to achieve a given temperature profile which is related to the oxygen concentration, and then raised and rotated at an increasing speed together with a high crystal rotation rate to achieve the uniformity.
    Type: Grant
    Filed: July 9, 1982
    Date of Patent: April 16, 1985
    Assignee: International Business Machines Corporation
    Inventors: Hitendra Ghosh, Ashok Murgai, Wolfgang A. Westdorp