Patent US2831493A successfully refreshed from Google Patents.
US2831493A
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US
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Fluid system with pressure halving valve
Assignee: RTX Corp
•
Filing: 1953-02-03
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Granted: 1958-04-22
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Expires: 1973-02-03
Abstract
No abstract record available.
Inventors
- 👤 Nelson R Richmond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:28
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; G; G05; G05D; G05D16/00; G05D16/04; G05D16/10; G05D16/101; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2607; Y10T137/261; Y10T137/7722; Y10T137/7781; Y10T137/7783
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1186780A
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US1249736A
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US1581454A
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US1766510A
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US1985443A
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US2063414A
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US2133170A
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US2411930A
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DE813156C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |