US2656848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duplex flow control apparatus
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1951-02-19
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Granted: 1953-10-27
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Expires: 1971-02-19
Abstract
No abstract record available.
Inventors
- 👤 Noon T Cyril
- 👤 Frank C Bayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:13
CPC Classifications
G; G05; G05D; G05D7/00; G05D7/03; F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; F16K15/033; F16K17/00; F16K17/02; F16K17/04; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/265; Y10T137/2663; Y10T137/7722; Y10T137/7758; Y10T137/7759; Y10T137/7837; Y10T137/7866; Y10T137/7867; Y10T137/7898
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US176500A
Cited
US822519A
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US1274680A
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US1843953A
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US2306029A
Cited
GB577132A
Cited
US2361227A
Cited
US2365095A
Cited
US2460774A
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US2389667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |