Patent US3400918A successfully refreshed from Google Patents.
US3400918A
Expired / Lapsed
US
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Sewage aerator
Assignee: Individual
•
Filing: 1967-03-08
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Granted: 1968-09-10
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Expires: 1987-03-08
Abstract
No abstract record available.
Inventors
- 👤 David S Maclaren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:31
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/20; C02F3/205; C02F3/207; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/233; B01F23/2331; B01F23/2336; B01F23/23364; C02F3/206; B01F23/23311; B01F27/00; B01F27/05; B01F27/11; B01F27/113; B01F27/19; B01F27/191; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1819637A
Cited
GB448852A
Cited
US3053390A
Cited
US2996287A
Cited
US2928661A
Cited
US3119779A
Cited
US3279768A
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 |