Patent ID: 7025060

Claim:
A personal breathing filter retained solely by the mouth of a user without need for additional support, said filter comprising: an exhaust tube comprising a forward end, a rearward end for insertion into the mouth of said user, and at least one vent located between said forward end and said rearward end; a filter housing integrally attached about the circumference of said exhaust tube at an attachment point between said vent and said rearward end, said filter housing extending concentrically with said exhaust tube and toward the forward end of said tube, thereby defining a void; a filter media retained within said void; and a one-way valve located between said vent and said forward end, said valve being positioned so that airflow is directed outward from said forward end; said one-way valve being sealed during inhalation to direct inhaled air through said filter media and vents, and said one-way valve being open during exhalation to direct exhaled air outward through said one-way valve.