Patent US3533508A successfully refreshed from Google Patents.
US3533508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Activated sludge installation with concentrically arranged circular tanks with one circular tank an aerating tank and rapidly running bridge
Assignee: Individual
•
Filing: 1968-01-16
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Granted: 1970-10-13
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Expires: 1988-01-16
Abstract
No abstract record available.
Inventors
- 👤 Jurgen Seipp
- 👤 August Schreiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:50
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1236; C02F3/1257; C02F3/20; C02F3/203; C02F3/205; 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) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |