国家/地区 中国（2）
IPC部 B（3）
IPC大类 B01（3）
IPC小类 B01D（3）
IPC B01D039/16（2）
发明人
公开年 2021（3）
申请年 2020（3）
专利权人

Multi-layered mask is useful for e.g. protecting against the aerosol transmission of COVID-19 comprises five layers characterized that first and last layers are made of e.g. cotton textile layers, natural fiber layers, and nanofibers layer.

SHIREESHA G, KARBARI S R, UTTARA K M, SUBRAMANYA K

Preparing long-lasting anti-odor gray board paper comprises e.g. preparing stock, and papermaking, adding composite anti-odor slurry to lining layer or core layer, adding surface layer and bottom layer with natural bamboo pulp.

XU W, CHEN H, FAN X, CHEN M, TONG H, XIA Q, XIA Y, ZHANG S

Seamless cylindrical filter bag is consists of first non-woven fabric, cylindrical cloth, second non-woven fabric and polytetrafluoroethylene microporous membrane are compounded.

GU K, YANG Z, GONG Z, CAO Q, WU J, WANG H, GU Y, WANG Z, ZHANG J