Patent US3752171A successfully refreshed from Google Patents.
US3752171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid gain change circuit
Assignee: United States Department of the Army
•
Filing: 1971-06-25
•
Granted: 1973-08-14
•
Expires: 1991-06-25
Abstract
Abstract A fluidic gain change circuit is disclosed that produces a variable output pressure for providing an adjustable gain guidance and control circuit in response to gain changing signals. For a relatively fixed input signal at control ports, fluid amplifiers respond to a power jet change to couple discrete or digital change signals to a proportional output stage. This allows a differential fluidic output signal to increase or decrease by discrete steps of fluid flow levels.
Inventors
- 👤 V Ayre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:14
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/08; F15C1/10; F15C1/12; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/206; Y10T137/212; Y10T137/2125; Y10T137/2147
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
108 words
A fluidic gain change circuit for independently amplifying incremental signals for selective summing to provide a stepped variable output, comprising: a plurality of fluidic input amplifiers for providing a fluidic output, each of said input amplifiers having first and second control ports connected in parallel for receiving identical input signals thereacross, a plurality of fluidic output amplifiers having control ports thereof respectively connected to the output of at least two of said input amplifiers for providing a stepped variable output responsive thereto, and a plurality of gain change amplifiers each having an output port coupled as a power input to respective input amplifiers for changing the state thereof.
Claim 2
Dependent Claim
108 words
A fluidic gain change circuit for independently amplifying incremental signals for selective summing to provide a stepped variable output, comprising: a plurality of fluidic input amplifiers for providing a fluidic output, each of said input amplifiers having first and second control ports connected in parallel for receiving identical input signals thereacross, a plurality of fluidic output amplifiers having control ports thereof respectively connected to the output of at least two of said input amplifiers for providing a stepped variable output responsive thereto, and a plurality of gain change amplifiers each having an output port coupled as a power input to respective input amplifiers for changing the state thereof.
Claim 3
Dependent Claim
66 words
A fluidic gain change circuit as set forth in claim 1 wherein said plurality of input amplifiers comprise at least two amplifiers, said plurality of output amplifiers is a single proportional amplifier having a differential output and control inputs coupled to outputs of said input amplifiers for providing said stepped output responsive thereto, and said plurality of gain change amplifiers include at least one bi-stable amplifier.
Claim 4
Dependent Claim
54 words
A fluidic gain change circuit as set forth in claim 1 wherein said plurality of input amplifiers comprise at least four amplifiers and said plurality of output amplifiers comprise at least two proportional amplifiers, each of said proportional amplifiers being responsive to at least two of said input amplifiers for providing an output signal.
Claim 5
Dependent Claim
45 words
A fluidic gain change circuit as set forth in claim 3 and further comprising a fluidic differential amplifier output stage having a constant power source input and at least four control inputs responsive to said proportional amplifier outputs for providing a stepped variable differential output.
Claim 6
Dependent Claim
21 words
A fluidic gain change circuit as set forth in claim 4 wherein said plurality of gain change amplifiers are bi-stable amplifiers.
Claim 7
Dependent Claim
97 words
In a fluidic gain change circuit having amplifying means and bi-stable fluidic switching means therefor, the method of changing the gain of an analog fluidic input comprising the steps of: a. splitting the analog input signal into a desired number of increments by paralleling the control input ports of a plurality of amplifiers across the input signal, b. amplifying each increment by individual amplifiers, c. gating each incremental amplifier for obtaining a variable quantity of incremental outputs, and d. summing the selected incremental outputs for providing a proportional output which is a function of the analog input.
Claim 8
Dependent Claim
97 words
In a fluidic gain change circuit having amplifying means and bi-stable fluidic switching means therefor, the method of changing the gain of an analog fluidic input comprising the steps of: a. splitting the analog input signal into a desired number of increments by paralleling the control input ports of a plurality of amplifiers across the input signal, b. amplifying each increment by individual amplifiers, c. gating each incremental amplifier for obtaining a variable quantity of incremental outputs, and d. summing the selected incremental outputs for providing a proportional output which is a function of the analog input.
References Cited (Backward Citations)
US3661163A
Cited
US3515159A
Cited
US3556121A
Cited
US3587609A
Cited
US3568702A
Cited
US3626473A
Cited
US3610261A
Cited
US3587616A
Cited
US3631874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |