US2579220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for indicating ballast changes necessary to maintain submersed submarines in trim
Assignee: Individual
•
Filing: 1949-05-31
•
Granted: 1951-12-18
•
Expires: 1969-05-31
Abstract
No abstract record available.
Inventors
- 👤 Allyn C Vine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:26
CPC Classifications
B; B63; B63G; B63G8/00; B63G8/14; B63G8/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2331810A
Cited
US1543137A
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US1601383A
Cited
US2052764A
Cited
US1986986A
Cited
US2179822A
Cited
US2319322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |