Patent US3788478A successfully refreshed from Google Patents.
US3788478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waste water treatment
Assignee: Shell USA Inc
•
Filing: 1971-08-19
•
Granted: 1974-01-29
•
Expires: 1991-08-19
Abstract
Abstract Waste water treating process wherein aeration and separation of bacterial matter to form a clarified effluent is accomplished in a single treating zone employing a submerged flotation cell.
Inventors
- 👤 W Savage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:18
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1278; C02F3/1294; C02F1/00; C02F1/24; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
192 words
An apparatus for biologically treating aqueous organicallycontaminated waste comprising in combination 1. an aeration basin containing a pool of aqueous waste and bacterial floc and having means for supplying aqueous waste thereunto and agitaion means located at the surface of the pool for ultimately contacting the waste, bacterial floc and air and 2. an open-topped flotation vessel positioned within the aeration basin entirely beneath the surface of the pool, said flotation vessel having a recycle inlet end and a discharge end and being provided with a. a discharge outlet positioned at the discharge and opposite a recycle inlet, said discharge outlet adapted to discharge clarified liquid from the flotation vessel and outside the aeration basin and b. a recycle conduit connected to said flotation vessel at the discharge outlet end and provided in flow sequence with an air inlet line, an inline pump, and an eductor, said inline pump and air inlet line being loCated outside the basin and said eductor being located within the basin, said recycle conduit opening into said flotation vessel through the recycle inlet, said eductor serving to draw unclarified suspension from the basin into the flotation vessel.
Claim 2
Independent Claim
192 words
An apparatus for biologically treating aqueous organicallycontaminated waste comprising in combination 1. an aeration basin containing a pool of aqueous waste and bacterial floc and having means for supplying aqueous waste thereunto and agitaion means located at the surface of the pool for ultimately contacting the waste, bacterial floc and air and 2. an open-topped flotation vessel positioned within the aeration basin entirely beneath the surface of the pool, said flotation vessel having a recycle inlet end and a discharge end and being provided with a. a discharge outlet positioned at the discharge and opposite a recycle inlet, said discharge outlet adapted to discharge clarified liquid from the flotation vessel and outside the aeration basin and b. a recycle conduit connected to said flotation vessel at the discharge outlet end and provided in flow sequence with an air inlet line, an inline pump, and an eductor, said inline pump and air inlet line being loCated outside the basin and said eductor being located within the basin, said recycle conduit opening into said flotation vessel through the recycle inlet, said eductor serving to draw unclarified suspension from the basin into the flotation vessel.
Claim 3
Dependent Claim
139 words
an open-topped flotation vessel positioned within the aeration basin entirely beneath the surface of the pool, said flotation vessel having a recycle inlet end and a discharge end and being provided with a. a discharge outlet positioned at the discharge and opposite a recycle inlet, said discharge outlet adapted to discharge clarified liquid from the flotation vessel and outside the aeration basin and b. a recycle conduit connected to said flotation vessel at the discharge outlet end and provided in flow sequence with an air inlet line, an inline pump, and an eductor, said inline pump and air inlet line being loCated outside the basin and said eductor being located within the basin, said recycle conduit opening into said flotation vessel through the recycle inlet, said eductor serving to draw unclarified suspension from the basin into the flotation vessel.
Claim 4
Dependent Claim
139 words
an open-topped flotation vessel positioned within the aeration basin entirely beneath the surface of the pool, said flotation vessel having a recycle inlet end and a discharge end and being provided with a. a discharge outlet positioned at the discharge and opposite a recycle inlet, said discharge outlet adapted to discharge clarified liquid from the flotation vessel and outside the aeration basin and b. a recycle conduit connected to said flotation vessel at the discharge outlet end and provided in flow sequence with an air inlet line, an inline pump, and an eductor, said inline pump and air inlet line being loCated outside the basin and said eductor being located within the basin, said recycle conduit opening into said flotation vessel through the recycle inlet, said eductor serving to draw unclarified suspension from the basin into the flotation vessel.
References Cited (Backward Citations)
US3224964A
Cited
US3043433A
Cited
US3246763A
Cited
US3298526A
Cited
US3617539A
Cited
US3684703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |