Patent ID: 8146594

Claim:
A personal respiratory protection device that comprises: a multi-layered structure that comprises filter medium; and first and second means for attaching a headband to hold the device in position on a wearer's face, wherein the multilayered structure is divided into a flat upper panel having an upper peripheral edge, a flat non-rectangular central panel and a lower panel having a lower peripheral edge, the central panel being separated from each of the upper and lower panels by first and second lines of demarcation, the first and second lines of demarcation converging towards the first and second means for attaching a headband; and wherein the multi-layered structure is capable of being folded at the respective lines of demarcation so that the device can be folded flat for storage and can be opened to form a cup-shaped off the face air chamber over the nose and mouth of the wearer while the upper peripheral edge and the lower peripheral edge contact the wearer's face when the device is in use.