US 11,877,609 B2
Mask with ePTFE membrane
Evit Park, Seoul (KR)
Assigned to Evit Global Co., Ltd., Seoul (KR)
Filed by Evit Global Co., Ltd., Seoul (KR)
Filed on Jul. 22, 2021, as Appl. No. 17/443,214.
Claims priority of application No. 10-2020-0097325 (KR), filed on Aug. 4, 2020.
Prior Publication US 2022/0039489 A1, Feb. 10, 2022
Int. Cl. A41D 13/11 (2006.01); C08L 27/18 (2006.01); A62B 23/02 (2006.01); A41D 31/14 (2019.01); C08J 5/18 (2006.01)
CPC A41D 13/1107 (2013.01) [A41D 13/1161 (2013.01); A41D 31/145 (2019.02); A62B 23/025 (2013.01); C08J 5/18 (2013.01); C08L 27/18 (2013.01)] 20 Claims
OG exemplary drawing
1. A mask with an expanded polytetrafluorethylene (ePTFE) membrane, the mask comprising:
a mask sheet for covering a wearer's nose and mouth, the mask sheet comprising:
an inner layer group located toward the wearer's face, the inner layer group having a first inner layer and a second inner layer;
an outer layer group located on an opposite side of mask sheet, the outer layer group having a first outer layer and a second outer layer; and
an ePTFE membrane located between the inner layer group and the outer layer group; and
a mask string which is connected to both ends of the mask sheet and is held to the wearer's ears,
wherein each of the first inner layer, the second inner layer, the first outer layer, and the second outer layer of the mask sheet are formed from a material selected from the group consisting of: polypropylene (PP) and polyethylene terephthalate (PET).