US3965013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gravity clarifier
Assignee: Individual
•
Filing: 1974-10-31
•
Granted: 1976-06-22
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Expires: 1994-10-31
Abstract
Abstract A gravity clarifier for separating biological sludge from the water by gravity settling, which comprises a cylindrical tank having a closed bottom with a downwardly depending truncated conical shell attached at its large end to the upper portion of the tank wall, with a peripheral trough near the top end of the tank and a weir for the overflow of effluent liquid into the trough. The influent conduit enters the tank tangentially and flows the raw mixture into the tank in the space between the outside of the inverted conical shell and the tank wall. The sludge is removed from the tank bottom near the center of the tank.
Inventors
- 👤 George F. Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:11
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/02; B01D21/24; B01D21/2405; B01D21/2411; B01D21/26; B01D21/267
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
143 words
A gravity clarifier for separating solids from liquid, comprising; a large diameter circular cylindrical open top tank having a closed bottom; a downwardly depending truncated conical shell attached at its large end to the tank wall; an axial circular trough near the top end of said tank and a weir for the overflow of effluent liquid into said trough, the upper portion of the tank between said conical shell lower end and said overflow weir providing a quiescent gravity settling zone; influent conduit means entering said tank tangentially below the large end of said truncated conical shell, the lower portion of the tank between the shell lower end and the tank bottom providing a swirling sludge bed directly beneath the quiescent settling zone; and means for the removal of the settled sludge from said tank bottom near the center of said tank bottom.
Claim 2
Dependent Claim
143 words
A gravity clarifier for separating solids from liquid, comprising; a large diameter circular cylindrical open top tank having a closed bottom; a downwardly depending truncated conical shell attached at its large end to the tank wall; an axial circular trough near the top end of said tank and a weir for the overflow of effluent liquid into said trough, the upper portion of the tank between said conical shell lower end and said overflow weir providing a quiescent gravity settling zone; influent conduit means entering said tank tangentially below the large end of said truncated conical shell, the lower portion of the tank between the shell lower end and the tank bottom providing a swirling sludge bed directly beneath the quiescent settling zone; and means for the removal of the settled sludge from said tank bottom near the center of said tank bottom.
Claim 3
Dependent Claim
22 words
The clarifier as in claim 1 in which the top edge of said conical shell provides the overflow weir into said trough.
Claim 4
Dependent Claim
22 words
The clarifier as in claim 1 in which said trough is attached to said tank wall on the inside of said tank.
Claim 5
Dependent Claim
22 words
The clarifier as in claim 1 in which said trough is attached to said tank wall on the outside of said tank.
Claim 6
Dependent Claim
25 words
The clarifier as in claim 1 including vent means to vent air from the closed space between said inverted conical shell and said tank wall.
Claim 7
Dependent Claim
27 words
The clarifier as in claim 1 including means to withdraw liquid, including floating material, from the closed space between said inverted conical shell and said tank wall.
References Cited (Backward Citations)
US1177849A
Cited
US3258123A
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US3397788A
Cited
US3622009A
Cited
US3666108A
Cited
US3698555A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |