US4477270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter
Assignee: Individual
•
Filing: 1983-01-07
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Granted: 1984-10-16
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Expires: 2003-01-07
Abstract
Abstract An air filter providing a filter chamber comprising an open core cage of activated charcoal wrapped by a first polyurethane foam pad of a predetermined density, all of which is covered by a second polyurethane filter blanket of a different density. The center bore of the chamber being unobstructed and having communication at one end with an air blower that evacuates the core, drawing ambient air therein through 360 degrees and exhausting filtered air therefrom.
Inventors
- 👤 Franz Tauch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:34
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0027; B01D46/0036; B01D46/24; B01D46/56; B01D46/62; B01D46/64; B01D2265/00; B01D2265/06; B01D2267/00; B01D2267/40; B01D2273/00; B01D2273/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
169 words
A filter for purifying air having a plurality of filter stages comprising: (a) a frame means having an open center core having opposite open ends, (b) means for sealing one of said open ends of said center core, (c) cage means mounted on said frame within said center core for holding a granular filter material, (d) a granular filter material contained within said cage means, (e) a first filter blanket, wrapped around the exterior of said cage means and having a pre-determined density, (f) a second filter blanket having a lesser density covering said first filter blanket, (g) an air diffuser mounted on said frame at its remaining open end and having communication with said center core, and (h) an air evacuating means within said air diffuser for evacuating air from within said center core through said open end of said frame means so as to create a vacuum within said center core which will be filled by filtered air drawn through said filter elements through a 360° plane.
Claim 2
Dependent Claim
169 words
A filter for purifying air having a plurality of filter stages comprising: (a) a frame means having an open center core having opposite open ends, (b) means for sealing one of said open ends of said center core, (c) cage means mounted on said frame within said center core for holding a granular filter material, (d) a granular filter material contained within said cage means, (e) a first filter blanket, wrapped around the exterior of said cage means and having a pre-determined density, (f) a second filter blanket having a lesser density covering said first filter blanket, (g) an air diffuser mounted on said frame at its remaining open end and having communication with said center core, and (h) an air evacuating means within said air diffuser for evacuating air from within said center core through said open end of said frame means so as to create a vacuum within said center core which will be filled by filtered air drawn through said filter elements through a 360° plane.
Claim 3
Dependent Claim
33 words
A filter for purifying air as defined by claim 1, wherein said grandular filter material comprises a quantity of activated charcoal retained within said cage means surrounding said center core of said frame.
Claim 4
Dependent Claim
40 words
A filter for purifying air as defined by claim 1, wherein said first filter blanket is a polyurethane foam having a density of 80 ppi. and the second filter blanket comprises a polyurethane foam having a density of 45 ppi.
Claim 5
Dependent Claim
34 words
A filter for purifying air as defined by claim 3, wherein said grandular filter material comprises a quantity of activated charcoal retained within said cage means surrounding said center core of said frame means.
Claim 6
Dependent Claim
30 words
A filter for purifying air as defined by claim 1 wherein said cage means comprises spaced apart walls formed from a suitable wire mesh extending about said open center core.
Claim 7
Dependent Claim
34 words
A filter for purifying air as defined by claim 5, wherein said grandular filter material comprises a quantity of activated charcoal retained within said cage means surrounding said center core of said frame means.
Claim 8
Dependent Claim
40 words
A filter for purifying air as defined by claim 5, wherein said first filter blanket is a polyurethane foam having a density of 80 ppi., and the second filter blanket comprises a polyurethane foam having a density of 45 ppi.
Claim 9
Dependent Claim
35 words
A filter for purifying air as defined by claim 1, wherein said air evacuating means comprises a blower adapted to evacuate air from within said center core and exhausting the same through said air diffuser.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |