Patent US2669834A successfully refreshed from Google Patents.
US2669834A
Expired / Lapsed
US
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Means for varying the discharge area of the tailpipe of a jet propelled plane
Assignee: Individual
•
Filing: 1948-07-19
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Granted: 1954-02-23
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Expires: 1968-07-19
Abstract
No abstract record available.
Inventors
- 👤 Jr Walter C Helms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:20
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US177239A
Cited
US340237A
Cited
GB191225641A
Cited
FR623163A
Cited
US2342262A
Cited
GB577949A
Cited
US2563745A
Cited
US2540594A
Cited
US2472949A
Cited
US2564671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |