公开(公告)号：US20220118294A1

公开(公告)日：2022-04-21

申请号：US17503166

申请日：2021-10-15

Applicant: The Trustees of Dartmouth College

Inventor： Zi Chen ,  Jing Fan ,  Matthew Liao

IPC: A62B23/02 ,  A62B18/08 ,  A62B18/02 ,  A61F9/02 ,  A41D13/11 ,  B01D45/06 ,  B01D45/08 ,  B01D50/20

Abstract: This invention provides a see-through full face mask and hood that integrates effective filtration for both inhaled and exhaled air. The mask includes a transparent visor mounted on a headband and surrounded by a frame. The headband or the frame (sides, bottom, etc.) can include a filtration assembly that allows passive inflow and outflow of air in a manner that is highly breathable. The frame generally seals against the users face in a comfortable manner. The visor can be surrounded by a subframe that can be moved upwardly out of engagement with a base frame—which remains attached to the wearer to expose the user's mouth for eating. The filtration assembly defines a plurality of tortuous or circuitous-path filtration tubes that employ bends, baffles, charged surfaces and/or other internal barriers to redirect airflow and thereby trap microdroplets containing pathogens until such pathogens can be rendered inactive.