US2777291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion chamber with removable flame tubes
Assignee: Parsons and Marine Engineering Turbine Research and Development Association
•
Filing: 1952-05-10
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Granted: 1957-01-15
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Expires: 1972-05-10
Abstract
No abstract record available.
Inventors
- 👤 Darling Robert Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:00
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/28; F23R3/34; F23R3/007; F23R3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US520481A
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US1380997A
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US1568479A
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GB449129A
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US2140785A
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US2119580A
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US2332866A
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US2430344A
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US2604797A
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US2565843A
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US2609040A
Cited
US2654219A
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US2715816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |