Patent US2087780A successfully refreshed from Google Patents.
US2689680A
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Means for regulating the characteristics of multistage axialflow compressors
Assignee: Rolls Royce PLC
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Filing: 1950-06-15
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Granted: 1954-09-21
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Expires: 1970-06-15
Abstract
No abstract record available.
Inventors
- 👤 Lovesey Alfred Cyril
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:33
CPC Classifications
F; F01; F01D; F01D17/00; F01D17/10; F01D17/12; F01D17/14; F01D17/16; F01D17/162
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2397060A
Cited
GB586565A
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US2382535A
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US2388208A
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US2434678A
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US2473329A
Cited
US2500070A
Cited
US2460778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |