US1866438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Submarine apparatus
Assignee: Individual
•
Filing: 1927-04-11
•
Granted: 1932-07-05
•
Expires: 1947-04-11
Abstract
No abstract record available.
Inventors
- 👤 Williamson Charlfs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:03
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/01; B; B63; B63C; B63C11/00; B63C11/34; B63C11/36; B63C11/38; E21B41/00; E21B41/06
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) | 1935-07-05 | 1936-01-04 | 1936-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-07-05 | 1940-01-04 | 1940-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-07-05 | 1944-01-04 | 1944-07-05 | $7700.00 | Window Closed / Lapsed |