The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 22, 1992
Filed:
May. 07, 1990
Franklin W Range, Athens, GA (US);
N Lee Wolfe, Athens, GA (US);
Bowolfe, Inc., Watkinsville, GA (US);
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.