Patents by Inventor Kanyawasam P. W. Pemawansa

Kanyawasam P. W. Pemawansa 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).

  • Polyaldehyde activated membranes
    Patent number: 4961852
    Abstract: An activated microporous membrane is provided, having aldehyde functional groups on its inner and outer surfaces. The aldehyde functionality on all surfaces provides for effective covalent bonding to the membrane by amine containing materials. The activated membrane can be made of a polysulfone/polyacrolein mixture or a polysulfone microporous membrane treated with a polyacrolein solution.
    Type: Grant
    Filed: March 9, 1989
    Date of Patent: October 9, 1990
    Assignee: Gelman Sciences, Inc.
    Inventors: Kanyawasam P. W. Pemawansa, Mark Heisler, Menahem Kraus