Patent US3078672A successfully refreshed from Google Patents.
Patent US3609658A successfully refreshed from Google Patents.
Patent US2332794A successfully refreshed from Google Patents.
US2014431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage filtering apparatus
Assignee: —
•
Filing: —
•
Granted: 1935-09-17
•
Expires: 1952-09-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:51
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/10; C02F3/101; B; B01; B01D; B01D29/00; B01D29/01; C02F3/06; C02F3/105; C02F3/107; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1938-09-16 | 1939-03-18 | 1939-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-09-16 | 1943-03-18 | 1943-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-09-16 | 1947-03-18 | 1947-09-17 | $7700.00 | Window Closed / Lapsed |