US3837494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage treatment apparatus
Assignee: STEVENSON BERNARD H AS TRUSTEE UNDER BERNARD H STEVENSON REVOCABLE INTER VIVOS TRUST DATED DEC 22 1976
•
Filing: 1972-08-16
•
Granted: 1974-09-24
•
Expires: 1992-08-16
Abstract
Abstract For use in a sewage treatment system, a settling tank and a filtering tank, each such tank having near its upper end an inlet and, at a slightly lower level, an opposite outlet, the outlet of the settling tank communicating with the inlet of the filtering tank, and each tank having in its nether region a section of downwardly progressively reducing cross section terminating in a floor provided with a central sludge withdrawal port. Each tank is provided with a downwardly extending baffle dividing its interior into two legs of unequal section communicating only near the tank floor; and the filtering tank having an upflow filter near the upper end of its outlet leg. A downwardly-flaring guard is concentrically suspended above each sludge withdrawal port and a lower section of each baffle is inclined to terminate above the apex of its associated guard substantially in the median vertical plane of the tank.
Inventors
- 👤 B Stevenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:24
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/0012
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
171 words
In a sewage treatment system, a settling tank whose right transaxial section is an equilateral polygon, the nether region only of said tank being of descending progressively reducing equilateral cross-sectional area, said tank being provided with an inlet near the upper end of a side wall positioned and adapted to receive a sludge suspension and being provided with an outlet near the upper end of an opposite side wall but at a level lower than said inlet, a central sludge discharge port in the floor of said tank, a downwardly-flaring guard of equilateral polygonal section suspended in said tank above said discharge port and substantially concentric therewith, and a baffle in said tank extending downwardly from a level at least as high as said inlet, the major length of said baffle being nearer to said first-named side wall than to said opposite side wall, and the nether region of said baffle inclining toward said discharge port and terminating above the apex of said guard and substantially in registry with said apex.
Claim 2
Dependent Claim
171 words
In a sewage treatment system, a settling tank whose right transaxial section is an equilateral polygon, the nether region only of said tank being of descending progressively reducing equilateral cross-sectional area, said tank being provided with an inlet near the upper end of a side wall positioned and adapted to receive a sludge suspension and being provided with an outlet near the upper end of an opposite side wall but at a level lower than said inlet, a central sludge discharge port in the floor of said tank, a downwardly-flaring guard of equilateral polygonal section suspended in said tank above said discharge port and substantially concentric therewith, and a baffle in said tank extending downwardly from a level at least as high as said inlet, the major length of said baffle being nearer to said first-named side wall than to said opposite side wall, and the nether region of said baffle inclining toward said discharge port and terminating above the apex of said guard and substantially in registry with said apex.
Claim 3
Dependent Claim
228 words
In combination, the settling tank of claim 1, a filtering tank whose right transaxial section is an equilateral polygon, the nether region only of said filtering tank being of descending progressively reducing equilateral cross-sectional area, said filter tank being provided with an inlet near the upper end of a side wall and communicating with the outlet of said settling tank, and said filtering tank being provided with an outlet near the upper end of an opposite side wall but at a level lower than said filter tank inlet, a central sludge discharge port in the floor of said filter tank, a downwardly-flaring guard of equilateral polygonal section suspended above said discharge port and substantially concentric therewith, a baffle in said filter tank extending downwardly from a level at least as high as said filter tank inlet, the major length of said baffle being nearer to said first-named filter tank side wall than to said opposite siDe wall thereof and the nether region of said baffle inclining toward said filter tank discharge port and terminating above the apex of said guard and substantially in registry with said apex to divide said filter tank into an inlet leg and an outlet leg communicating only beneath said baffle, and an up-flow filter filling said outlet leg in a region between the lower end of said baffle and said filter tank outlet.
Claim 4
Dependent Claim
211 words
In a sewage treatment system, a filtering tank whose right transaxial section is an equilateral polygon, the nether region only of said filtering tank being of descending progressively reducing equilateral cross-sectional area, said filter tank being provided with an inlet near the upper end of a side wall and with an outlet near the upper end of an opposite side wall but at a level lower than said filter tank inlet, a central sludge discharge port in the floor of said filter tank, a downwardly-flaring guard of equilateral polygonal section suspended above said discharge port and substantially concentric therewith, a baffle in said filter tank extending downwardly from a level at least as high as said filter tank inlet, the major length of said baffle being nearer to said first-named filter tank side wall than to said opposite side wall thereof and the nether region of said baffle inclining toward said filter tank discharge port and terminating above the apex of said guard and substantially in registry with said apex to divide said filter tank into an inlet leg and an outlet leg communicating only beneath said baffle, and an up-flow filter filling said outlet leg in a region between the lower end of said baffle and said filter tank outlet.
Claim 5
Dependent Claim
211 words
In a sewage treatment system, a filtering tank whose right transaxial section is an equilateral polygon, the nether region only of said filtering tank being of descending progressively reducing equilateral cross-sectional area, said filter tank being provided with an inlet near the upper end of a side wall and with an outlet near the upper end of an opposite side wall but at a level lower than said filter tank inlet, a central sludge discharge port in the floor of said filter tank, a downwardly-flaring guard of equilateral polygonal section suspended above said discharge port and substantially concentric therewith, a baffle in said filter tank extending downwardly from a level at least as high as said filter tank inlet, the major length of said baffle being nearer to said first-named filter tank side wall than to said opposite side wall thereof and the nether region of said baffle inclining toward said filter tank discharge port and terminating above the apex of said guard and substantially in registry with said apex to divide said filter tank into an inlet leg and an outlet leg communicating only beneath said baffle, and an up-flow filter filling said outlet leg in a region between the lower end of said baffle and said filter tank outlet.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |