US3613890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for biologically purifying sewage
Assignee: Gustavsbergs Fabriker AB
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Filing: 1969-09-10
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Granted: 1971-10-19
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Expires: 1989-09-10
Abstract
Abstract There is provided an apparatus for biologically purifying sewage from which the sludge has been removed. The apparatus causes a reduction of nitrogen in the sewage with the aid of aerobic micro-organisms and includes a trough with an inlet and an outlet and in which is arranged a rotor with a plurality of plates with vanes arranged between the plates which vanes are angularly displaced in relation to each other.
Inventors
- 👤 Ake Oscar Wilhelm Hellqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:31
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/08; C02F3/082; C02F1/00; C02F1/006; C02F3/006; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7313; Y10T137/7323; Y10T137/7358; Y10T137/7423; Y10T137/7426; Y10T137/7436
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
An apparatus for biologically purifying sewage and being of the type which includes a sewage receiving tank, agitating means mounted within said tank, means for actuating the agitating means, means for feeding sewage to the tank and means for removing the purified liquid, the agitating means comprising a rotor journaled for rotation in said tank and including a shaft, a plurality of sewage actuating plates, arranged in axially spaced locations along said shaft and concentrically affixed thereto for rotation therewith, a vane member arranged between axially adjacent plates, said vane members of axially adjacent plates being angularly displaced in relation to each other and eccentrically arranged in respect to said plates and being connected to said plates for rotation therewith and with said shaft, the ends of each vane lying on the same diametral, means for transferring a small quantity, of the purified, oxygenated liquid to the inlet end of said tank, and means adapted to rotate the rotor in a determined direction of rotation.
Claim 2
Dependent Claim
53 words
An apparatus according to claim 2, wherein said oxygenated liquid transfer means are in the form of at least one scoop mounted on the leading vane member and adapted to transfer the liquid back to the inlet end of the tank via a return line coacting between the scoop and said inlet end.
References Cited (Backward Citations)
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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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |