Patent US2476643A successfully refreshed from Google Patents.
US2476643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
By-pass system for cooling fans
Assignee: RTX Corp
•
Filing: 1944-07-01
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Granted: 1949-07-19
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Expires: 1964-07-01
Abstract
No abstract record available.
Inventors
- 👤 Wald Quentin Roosevelt
- 👤 James H Brewster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:40
CPC Classifications
F; F01; F01P; F01P7/00; F01P7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1181873A
Cited
US1376178A
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US1386493A
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US1598867A
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US1691593A
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US2077708A
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US2129826A
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US2146523A
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US2160281A
Cited
US2330622A
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US2340396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-18 | 1953-01-17 | 1953-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-18 | 1957-01-17 | 1957-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-18 | 1961-01-17 | 1961-07-19 | $7700.00 | Window Closed / Lapsed |