Patent US4470834A successfully refreshed from Google Patents.
US4470834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter
Assignee: Grabber Enterprises
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Filing: 1982-12-02
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Granted: 1984-09-11
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Expires: 2002-12-02
Abstract
Abstract An air filter for use with wood or coal stoves of the type having a plenum surrounding the firebox. The air filter includes a porous framework in the shape of a C-shaped channel which houses a filter pad. The outer and inner surfaces of the framework are porous and substantially open. The framework is preferably of a relatively stiff, but deformable, open weave material bounded along its edges by a circumferential frame. The inner surface defines an access opening through which the filter pad can be inserted. The air filter is sized to cover a recirculating air inlet of the stove. Magnetic strips allow the air filter to be easily and quickly mounted to the stove without modification.
Inventors
- 👤 Guy C. Fasanaro
- 👤 Kenneth B. Taylor
- 👤 Gerald J. Frades
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:16
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; F; F24; F24B; F24B7/00; F24B13/00; F24B13/002; Y; Y10; Y10S; Y10S55/00; Y10S55/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
163 words
An air filter for covering a recirculating air inlet of a stove, at least a portion of the region of the stove defining the air intake being a ferrous metal, the air filter comprising: an elongate, C-shaped channel framework having a substantially porous outer surface, an inner surface, lateral sides and open ends, said inner surface having spaced apart, parallel, solid edges defining an open area extending the length of said inner surface, the portions of said framework defining said open ends being solid, said outer surface, said inner surface and said lateral sides having the same length, said outer and inner surfaces having the same width and said lateral sides having the same depth; a generally flat filter pad housed within said framework; and a pair of spaced-apart elongate magnetic strips mounted to said parallel, solid edges, said magnetic strips extending substantially the entire length of said inner surface for fastening the air filter to cover the air intake of the stove.
Claim 2
Dependent Claim
163 words
An air filter for covering a recirculating air inlet of a stove, at least a portion of the region of the stove defining the air intake being a ferrous metal, the air filter comprising: an elongate, C-shaped channel framework having a substantially porous outer surface, an inner surface, lateral sides and open ends, said inner surface having spaced apart, parallel, solid edges defining an open area extending the length of said inner surface, the portions of said framework defining said open ends being solid, said outer surface, said inner surface and said lateral sides having the same length, said outer and inner surfaces having the same width and said lateral sides having the same depth; a generally flat filter pad housed within said framework; and a pair of spaced-apart elongate magnetic strips mounted to said parallel, solid edges, said magnetic strips extending substantially the entire length of said inner surface for fastening the air filter to cover the air intake of the stove.
Claim 3
Dependent Claim
52 words
The air filter of claim 1 wherein the width of said filter pad before mounting within the framework is greater than the width of said outer surface with the lateral edges of said filter pad folded back upon itself to compress said folded back lateral edges between said outer and inner surfaces.
Claim 4
Dependent Claim
55 words
The air filter of claim 2 wherein the thickness of said filter pad is about one-half the depth of said framework and the length of said filter pad before mounting within said framework is greater than the length of said framework so that said filter pad at least substantially fills the ends of said framework.
Claim 5
Dependent Claim
42 words
The air filter of claim 1 wherein said framework comprises a porous, C-shaped channel member and solid edge strips secured to said C-shaped channel member, said edge strips providing said solid edges and said portions of said framework defining said open ends.
References Cited (Backward Citations)
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US3164456A
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US3429434A
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US3793692A
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US3912473A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-11 | 1988-03-12 | 1988-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-11 | 1992-03-12 | 1992-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-11 | 1996-03-12 | 1996-09-11 | $7700.00 | Window Closed / Lapsed |