Patent ID: 6978782

Claim:
A full face mask comprising; an air filtration shell, said shell being made of a filtration material and having a three dimensional form suitably shaped to cover the nose, mouth and eyes of the wearer and to form a perimeter which surrounds the forehead, temples, cheek-bones, cheeks and chin areas of the wearer, said shell comprising a nose and mouth portion, a viewing lens portion, a forehead portion, a perimeter, a window for receiving a viewing lens and a window frame, a viewing lens, said viewing lens being an optically-correct transparent lens having a perimeter shaped to fit in said window and being bonded to the perimeter of said window frame, a face sealing rim made of a flexible material and having a suitably shaped perimeter and an aperture, said face sealing rim being attached to said perimeter of said air filtration shell and directly contacting the wearer's face and effecting a continuous seal between itself and the wearer's forehead, temples, cheek-bones, cheeks and chin areas, said shaped perimeter of said face sealing rim being defined by an interior outline and an exterior outline, said interior outline being suitably shaped to provide a wider viewing lens area and a narrower nose and mouth area, said mask further comprising a breathing chamber partition member that divides said breathing chamber into an upper breathing chamber and a lower breathing chamber, said partition member comprising a lateral wall which is surrounded with and defined by a front border, side borders and a contoured face-contacting border which is shaped to effect a seal between said lateral wall and the nose bridge and cheeks of the wearer's face, said lateral wall of said breathing chamber partition member further comprising at least one inhalation valve, said inhalation valve allowing flow of air only from the upper breathing chamber of said air filtration shell to the lower breathing chamber of said air filtration shell.