Patents by Inventor Rabindra N. Chakraborty

Rabindra N. Chakraborty 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 for radiofrequency wave etching
    Patent number: 6077787
    Abstract: A method for selective controlled etching of a material particularly by sequentially switching between two (2) or more modes of radiofrequency waves and/or by distance from a source of the microwaves. The modes and/or distance are selected depending upon the surface of the material to be etched. The etching is rapidly conducted at 0.5 mtorr to 10 torr, preferably using microwave plasma etching.
    Type: Grant
    Filed: September 25, 1995
    Date of Patent: June 20, 2000
    Assignees: Board of Trustees operating Michigan State University, Saint-Gobain/Norton Industrial Ceramics Corporation
    Inventors: Donnie K. Reinhard, Rabindra N. Chakraborty, Jes Asmussen, Paul D. Goldman
  • Method of synthetic diamond ablation with an oxygen plasma and synthetic diamonds etched accordingly
    Patent number: 5711698
    Abstract: A method for ablating a synthetic diamond having a pitted surface includes applying a colloidal graphite to the surface of the diamond and subjecting it to an oxygen plasma so that preferably approximately 50 microns are removed from the surface of the synthetic diamond. The resulting surface of the diamond is virtually pit free. Preferably, the diamond is then mechanically lapped for finishing.
    Type: Grant
    Filed: May 5, 1995
    Date of Patent: January 27, 1998
    Assignee: Saint-Gobain/Norton Industrial Ceramics Corp
    Inventors: Rabindra N. Chakraborty, Michael J. Ferrecchia, Paul D. Goldman, Donnie K. Reinhard