US2938538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow regulating valve
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1956-08-16
•
Granted: 1960-05-31
•
Expires: 1976-08-16
Abstract
No abstract record available.
Inventors
- 👤 Clifford H Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:17
CPC Classifications
G; G05; G05D; G05D7/00; G05D7/01; G05D7/0106; G05D7/0113; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7792; Y10T137/7837; Y10T137/7866
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US172163A
Cited
US375070A
Cited
US2704552A
Cited
US2704548A
Cited
GB454148A
Cited
US2615675A
Cited
US2584418A
Cited
US2767734A
Cited
US2827076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |