Patent US3620087A successfully refreshed from Google Patents.
US3620087A
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US
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Fluidic speed sensors
Assignee: Plessey BTR Ltd
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Filing: 1969-12-01
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Granted: 1971-11-16
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Expires: 1989-12-01
Abstract
Abstract A FLUIDIC ROTATION SPEED SENSING DEVICE COMPRISES AN OPERATING SURFACE OF A ROTATING BODY DISPOSED PERPENDICULAR TO THE AXIS OF ROTATION THEREOF, A NOZZLE ARRANGED TO DIRECT A JET OF FLUID INTO THE BOUNDARY LAYER OF SAID OPERATING SURFACE IN A DIRECTION HAVING A COMPONENT PERPENDICULAR TO THE AXIS OF ROTATION AND A COLLECTOR DISPOSED CONFRONTING THE NOZZLE. DUE TO BOUNDARY LAYER INTERACTION THE JET IS DEFLECTED IN THE DIRECTION OF MOVEMENT OF THE SURFACE SO THAT THE PRESSURE AT THE COLLECTOR PROVIDES AN INDICATION OF THE RATE OF ROTATION.
Inventors
- 👤 John Christopher Hammond Davis
- 👤 John William Leathers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:33
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/005; G; G01; G01P; G01P3/00; G01P3/26; G01P3/34; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/2273
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |