US2421699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auxiliary fuel tank
Assignee: Lockheed Martin Corp
•
Filing: 1944-05-12
•
Granted: 1947-06-03
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Expires: 1964-05-12
Abstract
No abstract record available.
Inventors
- 👤 Clarence L Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:57
CPC Classifications
B; B64; B64D; B64D37/00; B64D37/02; B64D37/06; B64D37/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1685458A
Cited
US1865749A
Cited
US1996281A
Cited
US2074201A
Cited
US2105307A
Cited
US2375858A
Cited
US2375423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-02 | 1950-12-02 | 1951-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-02 | 1954-12-02 | 1955-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-02 | 1958-12-02 | 1959-06-03 | $7700.00 | Window Closed / Lapsed |