Patent US2747266A successfully refreshed from Google Patents.
Patent US1707497A successfully refreshed from Google Patents.
Patent US1388294A successfully refreshed from Google Patents.
US1388294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaking mechanism for filtering apparatus
Assignee: American Zinc Lead and Smelting Co
•
Filing: 1920-12-13
•
Granted: 1921-08-23
•
Expires: 1940-12-13
Abstract
No abstract record available.
Inventors
- 👤 Pedersen John Edwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:36
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/0002; B01D46/0005; B01D46/56; B01D46/58; B01D46/66; B01D46/74; B01D46/76
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) | 1924-08-22 | 1925-02-21 | 1925-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-08-22 | 1929-02-21 | 1929-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-08-22 | 1933-02-21 | 1933-08-23 | $7700.00 | Window Closed / Lapsed |