Patent US2285697A successfully refreshed from Google Patents.
US2285697A
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Sewage treatment method and apparatus
Assignee: Individual
•
Filing: 1939-07-31
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Granted: 1942-06-09
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Expires: 1959-07-31
Abstract
No abstract record available.
Inventors
- 👤 Augustus C Durdin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:56
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/14; C02F3/16; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/234; B01F23/2342; B01F23/23421; 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) | 1945-06-08 | 1945-12-08 | 1946-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-06-08 | 1949-12-08 | 1950-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-06-08 | 1953-12-08 | 1954-06-09 | $7700.00 | Window Closed / Lapsed |