Patents Assigned to Puropore Inc.
  • High strength nylon blend membranes
    Patent number: 4477598
    Abstract: A casting solution of two nylons in formic acid, e.g., high molecular weight extrusion grade Nylon 66 homopolymer [.eta.] about 2 or higher, and nylon multipolymer 66, 610, 6 as a strengthening polymer and gelation promoter, when cast by either the dry or wet phase inversion processes, results in highly unexpected membranes of superior strength, flexibility, and uniformity, suitable for use in microfiltration and ultrafiltration.
    Type: Grant
    Filed: March 2, 1984
    Date of Patent: October 16, 1984
    Assignee: Puropore, Inc.
    Inventor: Robert E. Kesting
  • High strength nylon blend membranes
    Patent number: 4450126
    Abstract: A casting solution of two nylons in formic acid, e.g., high molecular weight extrusion grade Nylon 66 homopolymer [.eta.] about 2 or higher, and nylon multipolymer 66, 610, 6 as a strengthening polymer and gelation promoter, when cast by either the dry or wet phase inversion processes, results in highly unexpected membranes of superior strength, flexibility, and uniformity, suitable for use in microfiltration and ultrafiltration.
    Type: Grant
    Filed: April 21, 1982
    Date of Patent: May 22, 1984
    Assignee: Puropore, Inc.
    Inventor: Robert E. Kesting
  • Highly anisotropic membranes
    Patent number: 4333972
    Abstract: The discovery that highly anisotropic membranes, e.g. with a degree of anisotropy of five can for the very first time be produced by the dry phase inversion process by a very specific combination of polymers, solvent and non-solvent, optionally along with plasticizers and modifiers, all of which separately are known in membrane technology, the polymers consisting essentially of cellulose nitrate and cellulose nitrate-cellulose acetate mixed ester polymers, the solvent being methyl formate, propylene oxide, or mixtures thereof, and the non-solvents being isopropyl alcohol, t-butyl alcohol or mixtures thereof, is disclosed.
    Type: Grant
    Filed: June 25, 1980
    Date of Patent: June 8, 1982
    Assignee: Puropore, Inc.
    Inventor: Robert E. Kesting
  • 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