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:
Sep. 09, 2025
Filed:
Dec. 10, 2021
Applicant:
4c Air, Inc., Sunnyvale, CA (US);
Inventors:
Mervin Zhao, Sunnyvale, CA (US);
Wang Xiao, Sunnyvale, CA (US);
Assignee:
4C Air, Inc., Sunnyvale, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
C08L 67/04 (2006.01); B01D 39/16 (2006.01); B01D 46/54 (2006.01); B01D 69/10 (2006.01); B01D 71/48 (2006.01); B32B 5/02 (2006.01); B32B 5/26 (2006.01);
U.S. Cl.
CPC ...
C08L 67/04 (2013.01); B01D 39/1623 (2013.01); B01D 46/543 (2013.01); B01D 69/10 (2013.01); B01D 71/48 (2013.01); B32B 5/022 (2013.01); B32B 5/277 (2021.05); B01D 2239/0266 (2013.01); B01D 2239/0631 (2013.01); B01D 2239/1233 (2013.01); B32B 2262/0276 (2013.01); B32B 2262/0284 (2013.01); B32B 2307/7163 (2013.01); B32B 2571/00 (2013.01);
Abstract
A filtering film includes a porous substrate and a membrane disposed on the porous substrate. The membrane includes a plurality of fibers of one or more bio-degradable materials. The fibers have an average diameter of about 50 nm to about 3 μm. The one or more bio-degradable materials has a melt flow index of at least 5 g/10 min at 210° C. at a load of 2.16 kg.