US3604443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidic oscillators
Assignee: Plessey BTR Ltd
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Filing: 1969-10-23
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Granted: 1971-09-14
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Expires: 1989-10-23
Abstract
Abstract In a pure fluid oscillator of the RC type having a long time constant, only the reference pressure is used and the arrangement is such that the pressure in the capacitor or capacitors of the oscillator decays to this pressure. The oscillator comprising a fluidic bistable device, one output of which is connected via a fluidic RC circuit to the input of a fluidic amplifier. The output of this amplifier is so connected to an input of the bistable device that the bistable device changes from a first state to a second state when the input to the amplifier reaches a predetermined pressure. The invention is applicable to monostable circuits as well as to free-running oscillators.
Inventors
- 👤 John Christopher Hammond Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:32
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/22; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/212; Y10T137/2125; Y10T137/2147
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
67 words
A pure fluid oscillator comprising a fluidic bistable device, one output of which is connected via a fluidic resistance to a fluidic capacitor and thence to the input of an analogue amplifier, the output of which is so connected to an input of the bistable device that the bistable device changes from first state to second state when the input to the amplifier reaches a predetermined pressure.
Claim 2
Dependent Claim
67 words
A pure fluid oscillator comprising a fluidic bistable device, one output of which is connected via a fluidic resistance to a fluidic capacitor and thence to the input of an analogue amplifier, the output of which is so connected to an input of the bistable device that the bistable device changes from first state to second state when the input to the amplifier reaches a predetermined pressure.
Claim 3
Dependent Claim
41 words
A pure fluid oscillator as claimed in claim 1, in which the output of the amplifier is arranged to be inverted with respect to its input and connected to the input of the bistable device corresponding to said one output thereof.
Claim 4
Dependent Claim
38 words
A pure fluid oscillator as claimed in claim 1, in which the amplifier is a multistage amplifier having an odd number of stages, each stage comprising a proportional amplifier having its output port aligned with its supply jet.
Claim 5
Dependent Claim
55 words
A pure fluid oscillator as claimed in claim 1, in which said output of the bistable device is connected to the input of an OR/NOR device, the OR output of which is connected to said resistance and the NOR output of which provides an output in phase with the other output of the bistable device.
Claim 6
Dependent Claim
30 words
A pure fluid oscillator as claimed in claim 4, in which the OR/NOR device has a second input whereby the oscillator may be set or held in a predetermined state.
Claim 7
Dependent Claim
77 words
A pure fluid oscillator as claimed in claim 1, in which the other output of the bistable device is connected via a second resistance to a second capacitor and thence to the input of a second analogue amplifier the output of which is so connected to the other input of the bistable device that the bistable device changes from its second state to its first state when the input of the second amplifier reaches said predetermined pressure.
Claim 8
Dependent Claim
59 words
A pure fluid oscillator as claimed in claim 6, in which each amplifier is a multistage amplifier having an odd number of stages, the first stage of each amplifier comprising a respective inverting proportional amplifier output port aligned with its supply jet and subsequent stages are common to both amplifiers, each stage comprising a respective center dump proportional amplifier.
References Cited (Backward Citations)
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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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |