Patent US2639722A successfully refreshed from Google Patents.
US2639722A
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Pump unloading valve
Assignee: Bendix Aviation Corp
•
Filing: 1947-03-21
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Granted: 1953-05-26
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Expires: 1967-03-21
Abstract
No abstract record available.
Inventors
- 👤 Jr Walter Dorwin Teague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:16
CPC Classifications
F; F15; F15B; F15B1/00; F15B1/02; F15B1/027; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2622
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1636561A
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US2015801A
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US2271031A
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US2210295A
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US2372016A
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US2421133A
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US2429489A
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US2437480A
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US2513304A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |