Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1990-05-07
1992-12-22
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264215, 264216, B29C 6720
Patent
active
051732254
ABSTRACT:
A ultra-thin dense skin gas-controlling membrane that is impermeable to liquids, bacteria, and viruses, yet is permeable to small molecular weight gases, such as O.sub.2, CO.sub.2, NH.sub.3, N.sub.2, and water vapor, and a method for making the membrane. The membrane possesses specific gas transfer characteristic making it suitable for use in the culturing of biological materials. The membrane is incorporated into cell culture apparatus, such as roller bottle caps, for the benefit of optimally maintaining O.sub.2 and CO.sub.2 levels in the tissue culture container during all phases of cell growth. The membrane also acts as an absolute barrier to microbial contamination of the culture media within the culture container.
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Range Franklin W.
Wolfe N. Lee
Bowolfe, Inc.
Tentoni Leo B.
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