×

SEMIPERMEABLE OSMOTIC MEMBRANE AND METHOD OF PRODUCING SAME

  • US 3,661,634 A
  • Filed: 10/31/1969
  • Issued: 05/09/1972
  • Est. Priority Date: 10/31/1969
  • Status: Expired due to Term
First Claim
Patent Images

2. A process according to claim 1 wherein the ratio of blocked isocyanate groups to polymerized vinylpyrrolidone groups is greater than about 0.25.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×