US3817162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flue stack outlet
Assignee: Research Corp
•
Filing: 1973-03-27
•
Granted: 1974-06-18
•
Expires: 1993-03-27
Abstract
Abstract The effective height of smoke stacks is increased to minimize ground level concentration of the effluents entrained or contained in the issuing gases by minimizing the entrainment of the cold ambient air into the issuing plume, by modifying the exit velocity distribution of the gases. The invention may comprise an external extension or an internal attachment to existing stacks or the stack may include the features of the invention when it is designed and built.
Inventors
- 👤 G Guelph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:15
CPC Classifications
F; F23; F23L; F23L17/00; F23L17/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
127 words
A flue stack outlet for increasing the effective height of a smoke stack by minimizing the entrainment of the cold ambient air into the issuing plume comprising a plurality of concentric cylindrical sleeves mounted at the exit outlet of the stack, the inlet ends of all of the concentric channels formed by said sleeves being in direct communication with the stack outlet and the outlet ends of said channels being in direct communication with the ambient air, each channel so varying in cross-sectional area between its inlet and outlet ends as to modify the uniform velocity distribution of the gases in the stack into a velocity distribution in the form of a cone with the highest velocity at the center and the velocities decreasing radially outwardly therefrom.
Claim 2
Dependent Claim
127 words
A flue stack outlet for increasing the effective height of a smoke stack by minimizing the entrainment of the cold ambient air into the issuing plume comprising a plurality of concentric cylindrical sleeves mounted at the exit outlet of the stack, the inlet ends of all of the concentric channels formed by said sleeves being in direct communication with the stack outlet and the outlet ends of said channels being in direct communication with the ambient air, each channel so varying in cross-sectional area between its inlet and outlet ends as to modify the uniform velocity distribution of the gases in the stack into a velocity distribution in the form of a cone with the highest velocity at the center and the velocities decreasing radially outwardly therefrom.
Claim 3
Dependent Claim
24 words
The invention defined in claim 1 wherein the velocity modifying channels have a diffusing angle of from 3* to 8* between adjacent cylindrical sleeves.
Claim 4
Dependent Claim
16 words
The invention defined in claim 1 wherein there are from 3 to 5 concentric cylindrical sleeves.
Claim 5
Dependent Claim
24 words
The invention defined in claim 3 wherein the length of the cylindrical sleeves is from 1 to 2 times the diameter of the stack.
Claim 6
Dependent Claim
21 words
The invention defined in claim 3 further including a low velocity air jacket about the outermost of said concentric cylindrical sleeves.
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |