Patent US2438426A successfully refreshed from Google Patents.
US2438426A
Expired / Lapsed
US
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Centrifugal compressor
Assignee: Power Jets Research and Development Ltd
•
Filing: 1942-11-24
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Granted: 1948-03-23
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Expires: 1962-11-24
Abstract
No abstract record available.
Inventors
- 👤 Whittle Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:42
CPC Classifications
F; F04; F04D; F04D17/00; F04D17/08; F04D17/10; F04D17/105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1125118A
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GB137274A
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US1390237A
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US1640784A
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US1931692A
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US2210155A
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GB503652A
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US2135053A
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US2129808A
Cited
US2305136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-23 | 1951-09-22 | 1952-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-23 | 1955-09-22 | 1956-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-23 | 1959-09-22 | 1960-03-23 | $7700.00 | Window Closed / Lapsed |