US3574331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aeration tank for waste treatment
Assignee: Mitsubishi Kakoki Kaisha Ltd
•
Filing: 1969-07-15
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Granted: 1971-04-13
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Expires: 1989-07-15
Abstract
Abstract The aeration tank in a plant for waste treatment by means of activated sludge is about 30 meters high and slender, and waste and oxygen-bearing gas are supplied to the bottom of the tank at the prevailing hydrostatic pressure of more than 40 p.s.i.g., thereby accelerating oxygen absorption by the mainly aqueous waste material and increasing the processing capacity of the tank over shallower tanks of equal volume.
Inventors
- 👤 Keiji Kurosawa
- 👤 Makio Nakashio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:26
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/26; C02F3/24; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
28 words
In an apparatus as set forth in claim 1, each of said sections including an open vessel and a pipe leading into said vessel in a downward direction.
Claim 2
Dependent Claim
43 words
In an apparatus as set forth in claim 1, leg means depending from said nozzle means for engaging the bottom of said aeration tank and for thereby supporting the weight of said nozzle means when the nozzle means is on said supply level.
Claim 3
Dependent Claim
30 words
In an apparatus as set forth in claim 1, said nozzle means including a manifold and a plurality of nozzles communicating with said manifold and downwardly directed from the same.
Claim 4
Dependent Claim
77 words
In an apparatus as set forth in claim 4, a plurality of leg members pivotally attached to said manifold and depending therefrom for engaging the bottom of said aeration tank and for thereby supporting the weight of said nozzle means when the nozzle means is on said supply level, and abutment means on said manifold for limiting pivotal movement of each leg member to a position in which the leg member extends obliquely downwardly from said manifold.
Claim 5
Dependent Claim
44 words
In an apparatus as set forth in claim 1, agitator means mounted on said nozzle means for movement therewith by means of said hoisting means, and motor means for operating said agitator means and for thereby agitating sAid waste material in said aeration tank.
Claim 6
Dependent Claim
31 words
In an apparatus as set forth in claim 1, said effective height being at least four times the greatest internal horizontal dimension of said aeration tank as measured within said height.
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |