Patent ID: 11877609
Assignee: EVIT GLOBAL CO., LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC A  B  C | IPC A  C

Claim 19:
20. A face mask for covering a wearer's nose and mouth, the mask comprising:
a mask sheet comprising:
a first substantially rectangular layer having a first side facing toward a wearer's face and a second side facing away from the wearer's face, each side of the first layer having a central area, a first edge portion, and a second edge portion, the first layer being formed from polypropylene (PP);
a second substantially rectangular layer having a first side adjacent to and facing toward the second side of the first layer and a second side facing away from the first layer, each side of the second layer having a central area, a first edge portion, and a second edge portion, the second layer being formed from polyethylene terephthalate (PET);
a substantially rectangular membrane having a first side adjacent to and facing toward the second side of the second layer and a second side facing away from the second layer, each side of the membrane having a central area, a first edge portion, and a second edge portion, the membrane being formed from expanded polytetrafluorethylene (ePTFE);
a third substantially rectangular layer having a first side adjacent to and facing toward the second side of the membrane and a second side facing away from the membrane, each side of the third layer having a central area, a first edge portion, and a second edge portion, the second layer being formed from PET; and
a fourth substantially rectangular layer having a first side adjacent to and facing toward the second side of the third layer and a second side facing away from the third layer and being exposed to an exterior surface of the mask sheet, each side of the fourth layer having a central area, a first edge portion, and a second edge portion, the second layer being formed from PP;

a first mask string configured to extend around the wearer's ears, the first mask string being connected to the mask sheet along a first edge portion of the mask sheet; and
a second mask string configured to extend around the wearer's ears, the second mask string being connected to the mask sheet along a second edge portion of the mask sheet;
wherein:
the first edge portion of the first layer, the first edge portion of the second layer, the first edge portion of the membrane, the first edge portion of the third layer, and the first edge portion of the fourth layer are mutually bonded to form the first edge portion of the mask sheet; and
the second edge portion of the first layer, the second edge portion of the second layer, the second edge portion of the membrane, the second edge portion of the third layer, and the second edge portion of the fourth layer are mutually bonded to form the second edge portion of the mask sheet.