Patents by Inventor Suresh M. Ojha

Suresh M. Ojha 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).

  • Pulsed plasma process for treating a substrate
    Patent number: 4824690
    Abstract: In a pulsed radio frequency plasma deposition process the pulse repetition frequency is matched to the gas exchange rate. This is achieved by using a pulse width of 50 to 500 microseconds and a pulse repetition rate corresponding to the time within which gas is exchanged in the reaction region.
    Type: Grant
    Filed: November 3, 1987
    Date of Patent: April 25, 1989
    Assignee: Standard Telephones and Cables Public Limited Company
    Inventors: Rudolf A. H. Heinecke, Suresh M. Ojha, Ian P. Llewellyn
  • Surface treatment of plastics material
    Patent number: 4684535
    Abstract: Discontinuities, e.g. scratches, in a plastics surface are removed by exposing the surface to a pulsed radio frequency plasma comprising a mixture of argon and hydrogen. After melting has been effected the surface is exposed to an argon plasma to effect cross-linking to form a smooth surface layer.
    Type: Grant
    Filed: July 28, 1986
    Date of Patent: August 4, 1987
    Assignee: Standard Telephones & Cables
    Inventors: Rudolf A. H. Heinecke, Suresh M. Ojha, Ian P. Llewellyn