Patents by Inventor J. S. Gunasekera

J. S. Gunasekera 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).

  • Billet conditioning technique for manufacturing powder metallurgy preforms
    Patent number: 4762679
    Abstract: A process for manufacturing powder metallurgy (P/M) preforms which are conditioned for optimum intrinsic workability is described which comprises steps of heating a quantity of P/M material in a can to a first preselected temperature under vacuum to degas the material, compacting the canned material at a second preselected temperature under pressure to provide a compact of the material; or cold compacting the powder to about 75% density and degassing it at suitable temperature and then vacuum hot pressing the powder at about 0.
    Type: Grant
    Filed: July 6, 1987
    Date of Patent: August 9, 1988
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Harold L. Gegel, Yellapregada V. R. K. Prasad, Sokka M. Doraivelu, Raghavan Srinivasan, J. S. Gunasekera, Douglas R. Barker, James T. Morgan, Jr., James C. Malas, Kristine A. Lark, Lawrence E. Matson