Cellulose-based microporous membrane

US7381330B2 · kind B2 · utility

Assignee

• Sartorius Stedim Biotech GmbH · DE

Inventors

• Rebecca Petersen · Medford, US
• Markus Hollas · Oebisfelde, DE
• Hans Beer · Salzhemmendorf, DE
• Manfred Bobbert · Obernfeld, DE

Key dates

• Filing date: Jun 8, 2004
• Grant date: Jun 3, 2008
• Expiry date: Mar 6, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/249981
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

There is disclosed a cellulosic microporous filtration membrane with upper and lower porous protective layers with a porous sponge-type intermediate layer between the two protective layers, wherein the sponge-type structure consists of two isotropic regions having different pore sizes.