Patent US2557747A successfully refreshed from Google Patents.
US2557747A
Expired / Lapsed
US
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Supplying cooling air to turbine disks of gas-turbine engines
Assignee: Rolls Royce PLC
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Filing: 1947-10-13
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Granted: 1951-06-19
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Expires: 1967-10-13
Abstract
No abstract record available.
Inventors
- 👤 Judson Charles Alan
- 👤 Read John Radcliffe
- 👤 Hunter Philip Edgar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:57
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/12; F02C7/16; F02C7/18; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB319622A
Cited
US2241782A
Cited
US2404334A
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US2401826A
Cited
US2438998A
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US2427614A
Cited
US2418967A
Cited
US2470780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-18 | 1954-12-18 | 1955-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-18 | 1958-12-18 | 1959-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-18 | 1962-12-18 | 1963-06-19 | $7700.00 | Window Closed / Lapsed |