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US 8,262,782 B2Granted
Respirator filter canister
AssigneeAvon Protection Systems, Inc.
InventorJohn Schlaechter
Life of this patent
Estimating the term…
Abstract
A gas mask filter canister of varying shapes is filled by orienting the a fill opening to face upwardly, introducing into the fill opening a particulate filter material, and vibrating the filter canister at a frequency and amplitude, and for a time until a predetermined packing density is reached. The invention can be used to fill elliptical or other odd shaped filter canisters having a concave profiles to conform closely to the curvature of the wearer's face.
Claims9
A filter canister comprising:
- a housing formed by an inlet wall and a concave outlet wall that are spaced from each other and joined by a curved peripheral outer wall, the inlet and outlet walls having openings there for passage of air therethrough;
- a particulate filter material in the housing and forming a conformal filter element within the housing to filter air passing from the inlet wall to the outlet wall;
- wherein the housing with the particulate filter material therein has been vibrated at a frequency and amplitude, and for a time until a desired packing density is reached.
Dependencies are inferred from the claim text.