Patent US3384775A successfully refreshed from Google Patents.
US3754471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic shaft speed sensor
Assignee: Avco Corp
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Filing: 1972-02-23
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Granted: 1973-08-28
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Expires: 1992-02-23
Abstract
Abstract A cylindrical disk having a plurality of evenly spaced peripheral notches is mounted on a rotating shaft. The speed of the shaft is measured by radially directing air under pressure to the peripheral surface of the disk and by sensing the pressure changes each time the supply of air impinges on a notched portion. In a second embodiment air is axially directed onto the planar surface of a rotating disk provided with apertures or indentations. In a third embodiment air is directed onto a planar surface which is moving linearly.
Inventors
- 👤 R Hohenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:19
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/26; G01P3/263; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/218; Y10T137/2202; Y10T137/2207
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
28 words
The invention as defined in claim 1 wherein said surface is planar and rotates on an axis perpendicular thereto, said discontinuities being angularly spaced in a circumferential path.
Claim 2
Dependent Claim
19 words
The invention as defined in claim 1 wherein said surface is a planar surface moving in a linear path.
Claim 3
Dependent Claim
20 words
The invention as defined in claim 1 wherein said surface is cylindrical and rotates on the axis of said cylinder.
Claim 4
Dependent Claim
32 words
The invention as defined in claim 1 wherein said second tube is positioned coaxially within said first tube but spaced therefrom, said other ends of said first and second tubes being coplanar.
Claim 5
Dependent Claim
53 words
The invention as defined in claim 1, wherein said first and second tubes are abutting and parallel, and a third tube, said first and second tubes being positioned within but spaced from said third tube, said other ends of said first and second tubes being coplanar with an end of said third tube.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |