US2725265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve stem guides
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1951-11-26
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Granted: 1955-11-29
•
Expires: 1971-11-26
Abstract
No abstract record available.
Inventors
- 👤 Leonard G Daniels
- 👤 Harold E Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:18
CPC Classifications
F; F01; F01L; F01L3/00; F01L3/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49636; Y10T29/49643; Y10T29/49647; Y10T29/49668; Y10T428/00; Y10T428/12; Y10T428/12201; Y10T428/12292; Y10T428/12375; Y10T428/12493
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1370346A
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US1531267A
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US2156802A
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US2401483A
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US2350971A
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US2341860A
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GB565520A
Cited
US2404808A
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US2399773A
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US2470264A
Cited
GB646377A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-28 | 1959-05-30 | 1959-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-28 | 1963-05-30 | 1963-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-28 | 1967-05-30 | 1967-11-29 | $7700.00 | Window Closed / Lapsed |