US2634578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for varying the effective area of discharge orifices of jet engines or afterburners therefor
Assignee: McDonnell Aircraft Corp
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Filing: 1949-02-19
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Granted: 1953-04-14
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Expires: 1969-02-19
Abstract
No abstract record available.
Inventors
- 👤 George W Kallal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:07
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/06; F02K1/10; F02K1/12; F02K1/1207
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-13 | 1956-10-13 | 1957-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-13 | 1960-10-13 | 1961-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-13 | 1964-10-13 | 1965-04-14 | $7700.00 | Window Closed / Lapsed |