US2557438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel transfer system, including automatic and sequential selection of fuel tanks
Assignee: Lockheed Martin Corp
•
Filing: 1945-06-18
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Granted: 1951-06-19
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Expires: 1965-06-18
Abstract
No abstract record available.
Inventors
- 👤 Clarence L Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:58
CPC Classifications
B; B64; B64D; B64D37/00; B64D37/02; B64D37/14; B64D37/20; Y; Y10; Y10T; Y10T137/00; Y10T137/4673; Y10T137/469; Y10T137/4807; Y10T137/7287; Y10T137/7358; Y10T137/7368; Y10T137/7404; Y10T137/8593; Y10T137/85978; Y10T137/85986; Y10T137/86035; Y10T137/86389; Y10T137/86445; Y10T137/86461
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1219115A
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US1763394A
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US1856077A
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US1776877A
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US2275471A
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US2356786A
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US2394431A
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US2394506A
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US2409245A
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US2464827A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-18 | 1954-12-18 | 1955-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-18 | 1958-12-18 | 1959-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-18 | 1962-12-18 | 1963-06-19 | $7700.00 | Window Closed / Lapsed |