Patents by Inventor Sushma Rampal

Sushma Rampal 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).

  • Capillary electrophoretic system for separation of samples containing both positively and negatively charged components
    Patent number: 5466351
    Abstract: A sample having both positively and negatively charged components may be separated during the same run by injecting a plug of sample at both ends of the capillary and applying an electric field in the capillary, where there is insufficient electroosmotic flow in the capillary to reverse sample migration direction, such as in the case of a gel-filled column.
    Type: Grant
    Filed: March 31, 1995
    Date of Patent: November 14, 1995
    Assignee: Beckman Instruments, Inc.
    Inventors: Sushma Rampal, Jang B. Rampal, James C. Osborne
  • Capillary column containing removable separation gel composition and method of use
    Patent number: 5370777
    Abstract: Disclosed herein are capillary columns for capillary electrophoretic analysis of sample constituents. In an embodiment, the columns comprise a bifunctional layer comprising a positively charged amine group adsorbed to the inner wall of the capillary and an active functional group; a gel composition; hydrophilic polymer; and a separation composition capable of being removed from the column, interspersed within the remainder of the column. The disclosed columns are particularly well suited for the analysis of surfactant: proteinaceous material complexes, nucleic acid sequence, and analysis of restriction fragments according to size.
    Type: Grant
    Filed: May 15, 1992
    Date of Patent: December 6, 1994
    Assignee: Beckman Instruments, Inc.
    Inventors: Andras Guttman, Chia-Hui Shieh, Barry L. Karger, Stephen J. Pentoney, Jr., Kenneth D. Konrad, Sushma Rampal, Katalin Ganzler