Patents by Inventor Sivaram Kirshnan

Sivaram Kirshnan 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).

  • Color-stable polycarbonate composition resistant to gamma-radiation
    Patent number: 5280050
    Abstract: A thermoplastic polycarbonate molding composition which is rendered resistant to deterioration induced by exposure to gamma radiation is disclosed. The composition is imparted an improved degree of color stability upon the incorporation of a minor amount of a poly(alkylene oxide) oligomer and a halogenated aromatic acid derivative therewith. In addition, the composition is characterized by its low initial color and the small change in its yellowness index after a waiting period of several weeks.
    Type: Grant
    Filed: May 19, 1992
    Date of Patent: January 18, 1994
    Assignee: Miles Inc.
    Inventors: Douglas G. Powell, Sivaram Kirshnan