US4236443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chimney stack exhaust unit
Assignee: Individual
•
Filing: 1979-08-06
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Granted: 1980-12-02
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Expires: 1999-08-06
Abstract
Abstract A chimney stack exhaust treatment unit and an improved exhaust gas treatment system utilizing such a unit are disclosed. The unit comprises a generally spherical outer housing which fits over the mouth of a caustic-resistant chimney pipe and encloses a horizontally mounted squirrel cage fan which is driven by an electric motor situated above it. The fan is situated directly above the chimney mouth so that when it is rotated, exhaust gases are drawn up through the chimney and swirled around the inner walls of the outer housing. Exhaust ports near the top of the housing provide an exit for treated gas. An inner housing encloses a fan motor, isolating it from the interior of the outer sphere. A conduit connects an opening in the outer sphere with an opening in the inner housing, and the inner housing includes a mouth directly above the fan, whereby rotation of the fan also draws outside air through the inner housing to cool the motor.
Inventors
- 👤 George W. Schossow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:24
CPC Classifications
F; F23; F23L; F23L17/00; F23L17/02; F23J; F23J15/00; F23J15/06; F23L17/005; F23L17/14; F23J2217/00; F23J2217/50; F23L2900/00; F23L2900/15043
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
247 words
A chimney stack exhaust unit comprising: (a) a first, generally closed, spherical housing having a top portion and a bottom portion, said housing including a first opening in said bottom portion adapted to fit over a chimney stack mouth, plurality of second, outlet openings spaced annularly about said top portion of the housing, and a third opening in said top portion; (b) a squirrel cage fan mounted generally horizontally within the first housing above and adjacent to the first opening, whereby rotation of the fan draws exhaust air upwardly through the stack and forces said exhaust air outwardly and upwardly in a swirling motion around the inside walls of the first housing; (c) an electric motor mounted within the first housing above the fan, and means connecting said motor and the fan whereby the fan may be driven by the motor; (d) a second, generally closed housing having top and bottom portions mounted within the first housing and enclosing the motor, said second housing including a blower opening in said bottom portion directly above the fan, and an upper opening in said top portion; and (e) a conduit extending between the upper opening in the second housing and the third opening in the first housing, whereby rotation of the fan draws air from outside the first housing into its third opening, downwardly through the conduit, into the second housing via its upper opening, and outwardly into the first housing via the lower opening in the second housing.
Claim 2
Dependent Claim
247 words
A chimney stack exhaust unit comprising: (a) a first, generally closed, spherical housing having a top portion and a bottom portion, said housing including a first opening in said bottom portion adapted to fit over a chimney stack mouth, plurality of second, outlet openings spaced annularly about said top portion of the housing, and a third opening in said top portion; (b) a squirrel cage fan mounted generally horizontally within the first housing above and adjacent to the first opening, whereby rotation of the fan draws exhaust air upwardly through the stack and forces said exhaust air outwardly and upwardly in a swirling motion around the inside walls of the first housing; (c) an electric motor mounted within the first housing above the fan, and means connecting said motor and the fan whereby the fan may be driven by the motor; (d) a second, generally closed housing having top and bottom portions mounted within the first housing and enclosing the motor, said second housing including a blower opening in said bottom portion directly above the fan, and an upper opening in said top portion; and (e) a conduit extending between the upper opening in the second housing and the third opening in the first housing, whereby rotation of the fan draws air from outside the first housing into its third opening, downwardly through the conduit, into the second housing via its upper opening, and outwardly into the first housing via the lower opening in the second housing.
Claim 3
Dependent Claim
64 words
The chimney stack exhaust unit of claim 1 which further includes means for limiting the draft inducing capacity of the fan in such a way that a predetermined portion of the fan's capacity is utilized to draw cool air down through the second housing, and a second predetermined portion of the fans capacity is utilized to draw exhaust gases upwardly into the first housing.
Claim 4
Dependent Claim
44 words
The chimney stack exhaust unit of claim 2 which further includes baffle means mounted within the first housing adjacent the first opening for channeling condensate which runs down the housing walls away from the fan and down the first opening into the chimney stack.
Claim 5
Dependent Claim
27 words
The chimney stack exhaust unit of claim 3 which further includes means for preventing rain or snow from entering the first housing via the third opening therein.
Claim 6
Dependent Claim
38 words
The chimney stack exhaust unit of claim 4 wherein said first predetermined portion of the fan's draft inducing capacity is approximately 1/5 thereof and the second predetermined portion is approximately 4/5 of the total capacity of the fan.
Claim 7
Dependent Claim
194 words
A chimney stack exhaust unit, comprising: (a) a first, generally closed, housing including a top portion, a bottom portion with a downwardly and inwardly sloping wall, and inside surfaces of said top and bottom portions, said bottom portion having a first opening adapted to fit over a chimney stack mouth, and said top portion having a plurality of second openings spaced thereabout and a third opening; (b) a second, generally closed, housing mounted within said first housing and including a top portion with an upper opening and a bottom portion with a lower opening spaced from said first opening in said first housing; (c) means for conducting air outside first housing from said third opening into said second housing through said upper opening; and (d) means for drawing exhaust air upwardly through the stack and forcing it outwardly and upwardly in a swirling motion around the inside surfaces of said first housing and for drawing air from outside said first housing through said third opening, downwardly through said conducting means into said second housing via said upper opening, and outwardly into said first housing through said bottom opening into confluence with the exhaust air.
Claim 8
Dependent Claim
194 words
A chimney stack exhaust unit, comprising: (a) a first, generally closed, housing including a top portion, a bottom portion with a downwardly and inwardly sloping wall, and inside surfaces of said top and bottom portions, said bottom portion having a first opening adapted to fit over a chimney stack mouth, and said top portion having a plurality of second openings spaced thereabout and a third opening; (b) a second, generally closed, housing mounted within said first housing and including a top portion with an upper opening and a bottom portion with a lower opening spaced from said first opening in said first housing; (c) means for conducting air outside first housing from said third opening into said second housing through said upper opening; and (d) means for drawing exhaust air upwardly through the stack and forcing it outwardly and upwardly in a swirling motion around the inside surfaces of said first housing and for drawing air from outside said first housing through said third opening, downwardly through said conducting means into said second housing via said upper opening, and outwardly into said first housing through said bottom opening into confluence with the exhaust air.
Claim 9
Dependent Claim
46 words
The chimney stack exhaust unit of claim 6 wherein said drawing means comprises a motor driven squirrel cage type fan mounted generally horizontally within said first housing above and adjacent to said first opening and below and adjacent to said bottom opening in said second housing.
Claim 10
Dependent Claim
25 words
The chimney stack exhaust unit of claim 6 further comprising means for preventing rain or snow from entering said first housing through said third opening.
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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) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |