Asymmetric, semipermeable membranes of cyclic polyureas

US4045337A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Birger Knickel
• Hans Rudolph · Krefeld, DE
• Jurgen Hocker · Bensberg, DE
• Jurgen Lewalter · Odenthal, DE
• Hans J. Rosenkranz · Krefeld, DE

Key dates

• Filing date: Jun 24, 1975
• Grant date: Aug 30, 1977
• Expiry date: Jun 24, 1995

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D71/62
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Asymmetric, semipermeable membranes of polyhydantoins or polyparabanates.