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Patent US2638738A successfully refreshed from Google Patents.
US2638738A
Expired / Lapsed
US
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Ramjet engine having inlet cone diffuser automatically adjustable as to length and cone angle
Assignee: Individual
•
Filing: 1951-03-22
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Granted: 1953-05-19
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Expires: 1971-03-22
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert M Salter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:47
CPC Classifications
F; F02; F02K; F02K7/00; F02K7/10; Y; Y02; Y02T; Y02T50/00; Y02T50/60
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) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |