US2455299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making valves
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1945-04-18
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Granted: 1948-11-30
•
Expires: 1965-04-18
Abstract
No abstract record available.
Inventors
- 👤 Perry E Cooley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:40
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/001; B23P15/002; 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; Y10T29/49311; Y10T29/51; Y10T29/5116
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US126495A
Cited
US376673A
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US717886A
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US724270A
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US1503678A
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US1475939A
Cited
US2177192A
Cited
US2341469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-30 | 1952-05-31 | 1952-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-30 | 1956-05-31 | 1956-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-30 | 1960-05-31 | 1960-11-30 | $7700.00 | Window Closed / Lapsed |