Patents Assigned to National Research Concil of Canada
  • Method of casting a porous membrane of polymeric material
    Patent number: 4898698
    Abstract: A method of casting porous membranes of polymeric material is provided wherein the membrane has at least one of the following: a more homogeneous active skin layer for separation purposes with a lower molecular weight cut off, a more homogeneous active skin layer with a sharper molecular weight cut off curve, a relatively thinner active skin layer with a relatively greater flux for a given separation of a substance from a solution thereof, and relatively fewer imperfections through the active skin layer.
    Type: Grant
    Filed: December 7, 1988
    Date of Patent: February 6, 1990
    Assignee: National Research Concil of Canada
    Inventors: Thomas A. Tweedle, Oleh Kutowy, Andre Tremblay