Patent US4000757A successfully refreshed from Google Patents.
US4000757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High gain fluid amplifier
Assignee: United States Department of the Navy
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Filing: 1975-12-04
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Granted: 1977-01-04
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Expires: 1995-12-04
Abstract
Abstract A bistable fluidic amplifier having high gain is disclosed. Power fluid isupplied through an inlet port and lobe-shaped feedback cavities downstream provide an oscillating differential pressure or flow between a pair of outlets. A pair of opposed control ports are provided between the inlet port and the feedback cavities and a differential control pressure or flow applied to the control ports creates a differential outlet pressure or flow having a gain in the range of 10-15.
Inventors
- 👤 Peter A. Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:27
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/08; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/2229; Y10T137/2234; Y10T137/224; Y10T137/2256; Y10T137/2262
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
110 words
A high gain fluid amplifier comprising, an inlet for supplying power fluid, a centrally located output vent, a pair of differential flow outlets disposed one each on each side of said output vent, a pair of opposed lobe-shaped feedback cavities positioned between said inlet and said outlets for alternately switching fluid to said differential flow outlets, a pair of opposed lobe-shaped control cavities, a pair of control inlets connected one each into said opposed lobe-shaped control cavities for supplying control fluid for controlling movement of power fluid into said output vent and said differential flow outlets, and short angularly disposed sidewalls positioned between said control cavities and said feedback cavities.
Claim 2
Dependent Claim
110 words
A high gain fluid amplifier comprising, an inlet for supplying power fluid, a centrally located output vent, a pair of differential flow outlets disposed one each on each side of said output vent, a pair of opposed lobe-shaped feedback cavities positioned between said inlet and said outlets for alternately switching fluid to said differential flow outlets, a pair of opposed lobe-shaped control cavities, a pair of control inlets connected one each into said opposed lobe-shaped control cavities for supplying control fluid for controlling movement of power fluid into said output vent and said differential flow outlets, and short angularly disposed sidewalls positioned between said control cavities and said feedback cavities.
Claim 3
Dependent Claim
19 words
A high gain fluid amplifier as set forth in claim 1 wherein said inlet is a venturi flow nozzle.
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) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |