Patent US2756771A successfully refreshed from Google Patents.
US2756771A
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US
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Pressure-regulating valves for hydraulic systems
Assignee: Sperry Gyroscope Co Ltd
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Filing: 1952-05-21
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Granted: 1956-07-31
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Expires: 1972-05-21
Abstract
No abstract record available.
Inventors
- 👤 Spencer Dennis Lincoln
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:03
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/04; G05D16/10; G05D16/107; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US913650A
Cited
US962736A
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US1531146A
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US1733528A
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US2027762A
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US2410375A
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US2639693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-31 | 1960-01-30 | 1960-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-31 | 1964-01-30 | 1964-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-31 | 1968-01-30 | 1968-07-31 | $7700.00 | Window Closed / Lapsed |