Patent US3625240A successfully refreshed from Google Patents.
US3625240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic booster system
Assignee: Bendix Corp
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Filing: 1969-05-16
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Granted: 1971-12-07
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Expires: 1989-05-16
Abstract
Abstract A hydraulic booster system for a vehicle which is operable when the vehicle''s engine is running and also when the engine is not running provided the vehicle is in motion. Said hydraulic booster system including a flow control valve means for connecting a second pump means to the system upon partial or complete fluid pressure failure of a first pump means.
Inventors
- 👤 Stanley I Macduff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:59
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/16; B60T13/168; F; F15; F15B; F15B20/00; F15B20/004; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2564; Y10T137/2567; Y10T137/2569; Y10T137/2574; Y10T137/2579; Y10T137/2582; Y10T137/2605
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
176 words
In a control for hydraulic fluid, first and second inlet ports connected respectively to first and second pressurized sources, and outlet port connectible to a fluid motor, a return port connectible to a reservoir of hydraulic fluid, first means controlling flow between said first inlet port and said outlet and return ports, said first means including flow-responsive means normally closing off flow between said first inlet port and said return port and establishing flow between said first inlet port and said outlet port, and second means responsive to said first and second inlet port pressures for normally closing off flow between said second inlet port and said outlet port, said second means responsive to said first and second inlet port pressures so as to be responsive to a predetermined minimum pressure at said first inlet port to establish flow between said second inlet port and said outlet port; said second inlet port being communicated to said return port; said flow-responsive means being operable to control fluid communication between said second inlet port and said return port.
Claim 2
Dependent Claim
176 words
In a control for hydraulic fluid, first and second inlet ports connected respectively to first and second pressurized sources, and outlet port connectible to a fluid motor, a return port connectible to a reservoir of hydraulic fluid, first means controlling flow between said first inlet port and said outlet and return ports, said first means including flow-responsive means normally closing off flow between said first inlet port and said return port and establishing flow between said first inlet port and said outlet port, and second means responsive to said first and second inlet port pressures for normally closing off flow between said second inlet port and said outlet port, said second means responsive to said first and second inlet port pressures so as to be responsive to a predetermined minimum pressure at said first inlet port to establish flow between said second inlet port and said outlet port; said second inlet port being communicated to said return port; said flow-responsive means being operable to control fluid communication between said second inlet port and said return port.
Claim 3
Dependent Claim
39 words
A control for hydraulic fluid as recited in claim 1; and said flow-responsive means permitting flow of fluid between the first inlet port and the return port when a predetermined maximum pressure is established at said first inlet port.
Claim 4
Dependent Claim
84 words
A control for hydraulic fluid as recited in claim 2; and a bore connecting said first inlet port and said outlet port; said flow-responsive means including a shuttle member slidably mounted in said bore to control fluid flow between said first and second inlet ports and said return port; said shuttle member having passage means extending therethrough to communicate fluid to said outlet port, said passage means including a flow-restricting orifice to limit the pressure at the outlet port to a predetermined maximum level.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |