Patents Assigned to Puropore Inc.
  • Polyoxyethylene grafted membrane materials with grafting links derived from a diisocyanate
    Patent number: 4280970
    Abstract: Membrane forming polymers are converted to hydrophilic polymeric membranes by (a) grafting a polyoxyethylene chain to a membrane forming polymer structure and thereafter forming a membrane; (b) coating a membrane with a polymer to which a polyoxyethylene chain has been grafted; or (c) grafting in situ a polyoxyethylene chain to a formed membrane polymer.
    Type: Grant
    Filed: January 19, 1979
    Date of Patent: July 28, 1981
    Assignee: Puropore Inc.
    Inventor: Robert E. Kesting
  • Process for spinning dense hollow fiber cellulosic membrane
    Patent number: 4219517
    Abstract: A dense hollow fiber cellulosic membrane which possesses outstanding permeability and strength characteristics and the method of preparation thereof is disclosed.
    Type: Grant
    Filed: October 12, 1978
    Date of Patent: August 26, 1980
    Assignee: Puropore Inc.
    Inventor: Robert E. Kesting