Patent US1448607A successfully refreshed from Google Patents.
US1448607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insubmergible vessel
Assignee: Individual
•
Filing: 1921-01-06
•
Granted: 1923-03-13
•
Expires: 1941-01-06
Abstract
No abstract record available.
Inventors
- 👤 Tworski Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:03
CPC Classifications
B; B63; B63C; B63C7/00; B63C7/06; B63C7/10; B63B; B63B19/00; B63B19/08; B63B35/00; B63B35/34; B63B43/00; B63B43/02; B63B43/10; B63B43/14; B63B2043/145
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) | 1926-03-12 | 1926-09-11 | 1927-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-03-12 | 1930-09-11 | 1931-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-03-12 | 1934-09-11 | 1935-03-13 | $7700.00 | Window Closed / Lapsed |