US3696029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deep tank aeration using eductor tubes of elongate cross-section
Assignee: Chicago Bridge and Iron Co
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Filing: 1970-03-16
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Granted: 1972-10-03
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Expires: 1990-03-16
Abstract
Abstract AERATION OF HUGE QUANTITIES OF SEWAGE IN VERY DEEP TANKS IS MADE PRACTICABLE BY EFFICIENT USE OF EDUCTOR TUBES. THE AIR IS LIBERATED AT ONLY A MODERATE DEPTH, THE TUBES EXTEND DOWNWARDLY FROM ONLY SLIGHTLY ABOVE THE LEVEL OF LIBERATION, AND THE TUBES ARE ELONGATE IN HORIZONTAL CROSS- SECTION FOR EFFECTIVE UTILIZATION OF THE FULL CROSS-SECTION. THERE IS A BAFFLE AT SURFACE LEVEL ABOVE THE TUBES.
Inventors
- 👤 James Donald Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:11
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/20; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |