Patent US2944731A successfully refreshed from Google Patents.
US2944731A
Expired / Lapsed
US
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Debris traps for engine-air inlets
Assignee: Lockheed Martin Corp
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Filing: 1956-05-17
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Granted: 1960-07-12
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Expires: 1976-05-17
Abstract
No abstract record available.
Inventors
- 👤 Kastan Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:45
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/04; F02C7/05; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T137/00; Y10T137/2713; Y10T137/2842; Y10T137/2911; Y10T137/8593
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2735612A
Cited
US1838117A
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US2288734A
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US2047568A
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US2636666A
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US2600302A
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US2750737A
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US2802618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |