Patents Assigned to Desalination Systems
  • Semipermeable membranes
    Patent number: 4828708
    Abstract: A reverse osmosis membrane with excellent nitrate rejection that is particularly suitable for point-of-use drinking water purposes. The reverse osmosis membrane is a composite material comprising a porous support layer and an ultrathin polyamide desalinizing layer which is the interfacial condensation reaction product of (a) meta-phenylenediamine and (b) a mixture of a major portion of isophthaloyl chloride and a minor proportion of trimesoyl chloride.
    Type: Grant
    Filed: September 28, 1987
    Date of Patent: May 9, 1989
    Assignee: Desalination Systems
    Inventor: Donald T. Bray