Active-particulate air filter having monolith primary filter and polishing filter
Assignee3M Innovative Properties Company
InventorsBritton G. Billingsley, Larry A. Brey
Life of this patent
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Abstract
An air filter that includes a primary filter and a polishing filter. The primary filter comprises a monolith 10 that contains active-particulate. The air-to-be-filtered travels through the primary filter in a path generally parallel to the passageways 12. The polishing filter 36 has first and second major surfaces and also contains active-particulate. The polishing filter is generally arranged such that air travels from the first major surface to the second major surface when passing through it. The inventive filter demonstrates extraordinary performance over the same primary and polishing filters taken individually.
Claims20
An air filter that comprises:
- (a) a monolithic primary filter that comprises activated carbon in its generally parallel passageways;
- and
- (b) a polishing filter that has first and second major surfaces and that also contains activated carbon, the polishing filter being generally arranged such that air travels from the first major surface to the second major surface when passing therethrough.
A method of making an air filter, which method comprises:
- (a) providing a monolithic filter that comprises an inlet and an exit and that comprises activated carbon in its generally parallel passageways;
- and
- (b) juxtapositioning a polishing filter to the monolithic filter at the exit thereof.
A method of filtering air, which method comprises:
- (a) introducing the air to a first end of a monolithic filter that contains activated carbon in its passageways;
- (b) passing the air through the monolithic filter in a direction parallel to the passageways such that the fluid exits the monolithic filter at a second end;
- and then
- (c) passing the air through a polishing filter.
Dependencies are inferred from the claim text.