US2648490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supercharger duct system
Assignee: Lockheed Martin Corp
•
Filing: 1947-10-04
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Granted: 1953-08-11
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Expires: 1967-10-04
Abstract
No abstract record available.
Inventors
- 👤 Bernard L Messinger
- 👤 Howard H Gray
- 👤 Robert R Richolt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:00
CPC Classifications
B; B64; B64D; B64D13/00; B64D13/02; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/7722; Y10T137/7758; Y10T137/7759; Y10T137/7781; Y10T137/7784; Y10T137/7786; Y10T137/7793; Y10T137/7794; Y10T137/7837; Y10T137/7847; Y10T137/8593; Y10T137/85978; Y10T137/86131; Y10T137/86163
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1210030A
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US1267880A
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US859341A
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US1052172A
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GB191326987A
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US1222352A
Cited
US1280477A
Cited
GB344737A
Cited
US2000721A
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US2451835A
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US2380777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |