Patent US5520634A successfully refreshed from Google Patents.
US2858975A
Expired / Lapsed
US
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Turbo-machines
Assignee: Ruston and Hornsby Ltd
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Filing: 1955-04-27
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Granted: 1958-11-04
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Expires: 1975-04-27
Abstract
No abstract record available.
Inventors
- 👤 Geoffrey B R Feilden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:13
CPC Classifications
F; F01; F01D; F01D25/00; F01D25/18; F01D25/183
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1853973A
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US2485447A
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US2326824A
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US2439447A
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US2407807A
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US2609065A
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US2660367A
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US2721747A
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US2692991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-03 | 1962-05-05 | 1962-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-03 | 1966-05-05 | 1966-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-03 | 1970-05-05 | 1970-11-04 | $7700.00 | Window Closed / Lapsed |