US2411734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold worked hollow stem valve
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1944-08-02
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Granted: 1946-11-26
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Expires: 1964-08-02
Abstract
No abstract record available.
Inventors
- 👤 John M Kerwin
- 👤 Samuel H Norton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:42
CPC Classifications
B; B21; B21K; B21K1/00; B21K1/20; B21K1/22; F; F01; F01L; F01L3/00; F01L3/12; F01L3/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49307
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-11-25 | 1950-05-27 | 1950-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-11-25 | 1954-05-27 | 1954-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-11-25 | 1958-05-27 | 1958-11-26 | $7700.00 | Window Closed / Lapsed |