Dirt cup filter with pre-filtration cap

Details Dirt cup filter with pre-filtration cap Dirt cup filter with pre-filtration cap

2006-11-14

2006-11-14

Smith, Duane (Department: 1724)

Gas separation

Plural serial basically diverse separating media

Plural stages in unitary casing

C055S413000, C055S426000, C055S459100, C055SDIG030, C055S482000, C055S486000, C055S487000, C055S498000, C055S501000, C055S505000, C055S510000, C055S521000, C055S529000, C015S347000, C015S352000, C015S353000

Reexamination Certificate

active

07135051

ABSTRACT:
A dual-stage vacuum cleaner filter with a pre-filtration cap having pre-filtering screens. A base with an aperture and a filter media strip pleated in the shape of a frustocone can be mounted within the dirt cup of a handheld vacuum. A circular, planar gas impermeable lid is sealingly fixed at the end of the filter media strip opposite the base. The cap is removably mounted to the base covering the filter media strip and lid. The cap has sidewall and endwall pre-filtering screens, and when the sidewall screens become loaded with debris, the endwall screen permits air to flow through a gap between the cap and the lid to the filter media strip.

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