US3400822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extended aeration sewage treatment plants
Assignee: Macleod & Miller Engineers Ltd
•
Filing: 1966-09-07
•
Granted: 1968-09-10
•
Expires: 1986-09-07
Abstract
No abstract record available.
Inventors
- 👤 Mckeown John Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:14
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/24; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1790975A
Cited
DE562376C
Cited
US2574685A
Cited
US2555201A
Cited
US2642394A
Cited
US2987186A
Cited
GB886585A
Cited
US3195727A
Cited
US3220706A
Cited
US3355023A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-10 | 1972-03-11 | 1972-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-10 | 1976-03-11 | 1976-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-10 | 1980-03-11 | 1980-09-10 | $7700.00 | Window Closed / Lapsed |