Patent US810617A successfully refreshed from Google Patents.
US2439447A
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US
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Turbine bearing construction
Assignee: RTX Corp
•
Filing: 1944-01-28
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Granted: 1948-04-13
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Expires: 1964-01-28
Abstract
No abstract record available.
Inventors
- 👤 Richard S Buck
- 👤 Walter A Ledwith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:38
CPC Classifications
F; F01; F01D; F01D25/00; F01D25/18; F01D25/183; F01D25/186
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1328234A
Cited
US1253940A
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CH108134A
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US1780804A
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US1966855A
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US2223847A
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GB456738A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-13 | 1951-10-13 | 1952-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-13 | 1955-10-13 | 1956-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-13 | 1959-10-13 | 1960-04-13 | $7700.00 | Window Closed / Lapsed |