US1915240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage purification
Assignee: Individual
•
Filing: 1932-11-28
•
Granted: 1933-06-20
•
Expires: 1952-11-28
Abstract
No abstract record available.
Inventors
- 👤 Alfred R Putnam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:30
CPC Classifications
C; C02; C02F; C02F9/00; C02F11/00; C02F11/12; C02F11/13
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) | 1936-06-19 | 1936-12-19 | 1937-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-06-19 | 1940-12-19 | 1941-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-06-19 | 1944-12-19 | 1945-06-20 | $7700.00 | Window Closed / Lapsed |