US3857412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Notch tracking fluidic frequency filter
Assignee: United States Department of the Army
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Filing: 1973-07-12
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Granted: 1974-12-31
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Expires: 1993-07-12
Abstract
Abstract A fluidic system having three parallel paths sensitive to the input frequency applied in parallel to the paths. The first path consists of one or more fluidic amplifiers providing an overall gain g and some degree of isolation between frequency sensitive networks. The second path is a proportional gain path and may range from a resistance attenuation network to one or more fluidic amplifiers depending on the desired damping factor. The third path consists of one or more fluidic amplifiers and has a gain kg. Both the first and third paths have overall transfer functions which can be expressed in terms of simple cascaded lag time constants. In addition, a fluidic phase discriminator monitors the phase shift of the signal across the network and continually adjusts the gain of one path to maintain zero phase shift across the network.
Inventors
- 👤 C Ringwall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:28
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/14; F15C1/02; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/212; Y10T137/218; Y10T137/2185
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
135 words
A notch tracking fluidic frequency filter including first, second, and third parallel fluid paths having a common bipolar fluidic signal input; a fluidic output summer for said fluid paths; said first fluid path including fluidic means for introducing a time lag to signals on said input; said second fluid path including fluidic means for providing a proportional gain to signals on said fluidic input; and said third fluid path including fluidic means for introducing a time lag and a gain k to signals on said fluidic input whereby k is greater than 1; and a fluidic phase discriminator having fluid control inputs and a fluid output, with said control fluid inputs connected to said common fluidic signal input and said fluidic output summer and said fluid output connected to said means in said third path.
Claim 2
Dependent Claim
135 words
A notch tracking fluidic frequency filter including first, second, and third parallel fluid paths having a common bipolar fluidic signal input; a fluidic output summer for said fluid paths; said first fluid path including fluidic means for introducing a time lag to signals on said input; said second fluid path including fluidic means for providing a proportional gain to signals on said fluidic input; and said third fluid path including fluidic means for introducing a time lag and a gain k to signals on said fluidic input whereby k is greater than 1; and a fluidic phase discriminator having fluid control inputs and a fluid output, with said control fluid inputs connected to said common fluidic signal input and said fluidic output summer and said fluid output connected to said means in said third path.
Claim 3
Dependent Claim
87 words
The fluidic filter as defined in claim 1 wherein said first fluid path includes first and second fluidic amplifiers, each having a fluid power jet, fluid control jets, and fluid output ports, with said control jets of said first amplifier connected to the poles of said common fluidic signal input; first fluidic means connecting said output ports of said first amplifier to said control jets of said second amplifier; and second fluidic means connecting said output ports of said second fluidic amplifier to said fluidic output summer.
Claim 4
Dependent Claim
28 words
The filter as defined in claim 2 wherein said first fluidic means connecting comprises fluidic capacitors; and said fluidic second means connecting comprises series-connected fluidic capacitors and resistors.
Claim 5
Dependent Claim
20 words
The fluid filter as defined in claim 3 wherein said second fluid path includes at least a third fluidic amplifier.
Claim 6
Dependent Claim
17 words
The fluidic filter as defined in claim 3 wherein said second fluid path includes fluidic resistive means.
Claim 7
Dependent Claim
117 words
The fluidic filter as defined in claim 5 wherein said third fluid path includes fourth and fifth fluidic amplifiers, each having a power jet, control jets, and output ports, said fourth amplifier having two fluid control jets; third fluidic means connecting said control jets of said fourth fluidic amplifier to one pole of said common fluidic signal input; fourth fluidic means connecting one of the fluid output ports of said fourth fluidic amplifier to fluid control jets of said fifth fluidic amplifier, the other fluid output ports of said fifth fluidic amplifier being dumped to fluidic system sump; and fifth fluidic means connecting said output fluid ports of said fifth fluidic amplifier to said fluidic output summer.
Claim 8
Dependent Claim
67 words
The fluidic filter as defined in claim 6 wherein said third fluidic means connecting includes a series connected fluidic resistor and a fluidic capacitor connected between said one pole of said common fluidic signal input and one control jet of said fourth fluidic amplifier and further including another fluidic resistor connected bEtween said common fluidic signal input and the other control jet of said fourth fluidic amplifier.
Claim 9
Dependent Claim
68 words
The fluidic filter as defined in claim 6 wherein said fourth fluidic means connecting includes a series connected fluidic resistor and fluidic capacitor connected between one output port of said fourth amplifier and one control jet of said fifth fluidic amplifier and further including another fluidic resistor connected between said one output port of said fourth fluidic amplifier and the other control jet of said fifth fluidic amplifier.
Claim 10
Dependent Claim
91 words
The fluidic filter as defined in claim 6 wherein said fluidic phase discriminator includes first and second fluidic rectifiers each having a power jet, first and second control jets, and an output port; and sixth fluidic means connecting said first pole of said common fluidic signal input to said first control jets of said fluidic rectifiers; with said second control jets of said fluidic rectifiers connected to the output port of said fluidic output summer; and said output ports of said fluidic rectifiers connected to input ports of said fifth amplifier.
Claim 11
Dependent Claim
112 words
The fluidic filter as defined in claim 9 wherein said sixth fluidic means connecting includes a seventh fluidic amplifier having first and second control jets, a power jet, and first and second output ports, with the series connection of a fluidic resistor and a fluidic capacitor between said one pole of said common fluidic signal input and said first control jet of said seventh fluidic amplifier, a fluidic resistor connected between said one pole of said common fluidic signal input and said second control jet of said seventh fluidic amplifier, and wherein said output ports of said seventh fluidic amplifier are respectively connected to said first control jets of said fluidic rectifiers.
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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) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |