Patent US3374893A successfully refreshed from Google Patents.
US3374893A
Expired / Lapsed
US
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Sewage purification plant
Assignee: G D Peters & Co (engineering) Ltd
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Filing: 1967-05-23
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Granted: 1968-03-26
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Expires: 1987-05-23
Abstract
No abstract record available.
Inventors
- 👤 Stretton Henry Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:07
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/006; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/232; B01F23/2323; B01F23/23231; C02F3/00; C02F3/02; C02F3/12; C02F3/22; C02F3/223; C02F3/24; G; G05; G05D; G05D7/00; G05D7/01; G05D7/0166; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-26 | 1971-09-25 | 1972-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-26 | 1975-09-25 | 1976-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-26 | 1979-09-25 | 1980-03-26 | $7700.00 | Window Closed / Lapsed |