US2468864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage treatment and oil and water separation
Assignee: Individual
•
Filing: 1945-12-29
•
Granted: 1949-05-03
•
Expires: 1965-12-29
Abstract
No abstract record available.
Inventors
- 👤 Warren M Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:20
CPC Classifications
E; E02; E02B; E02B15/00; E02B15/04; E02B15/10; B; B01; B01D; B01D17/00; B01D17/02; B01D17/0205; B01D17/0208; B01D17/0211; B01D17/0214; B01D17/04; B01D17/045; C; C02; C02F; C02F3/00; C02F3/02; Y; Y02; Y02A; Y02A20/00; Y02A20/20; Y02A20/204; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-02 | 1952-11-01 | 1953-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-02 | 1956-11-01 | 1957-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-02 | 1960-11-01 | 1961-05-03 | $7700.00 | Window Closed / Lapsed |