US 7,025,060 B1Granted

Personal breathing filter

OwnerAlexander J. G. Nicholsoninventor

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Abstract

A personal air filtration device has a cylindrical exhalation tube, with a one-way valve thereon. Concentric around the periphery of the exhalation tube and integrally connected to the exhalation tube rearward (proximate the user's mouth) of the one-way valve is a filter media housing. Filter media is contained between the housing and the tube. A plurality of perforations in the exhalation tube, rearward of the one way valve but forward from the housing connection ring, provide inhaled air ingress to the exhalation tube. Inhaled air forces the one-way valve closed, so that air is directed through the filter media, passes through the perforations and into the exhalation tube where the user can take in the cleansed air. The pressure of the exhaled air through the exhalation tube causes the one-way valve to open, so that exertion by the user is minimized.

Claims16

Dependent claims

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.

3 more elements

Dependencies are inferred from the claim text.