US4276489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple coil electromagnetic pickup
Assignee: Safran Aircraft Engines SAS
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Filing: 1979-07-18
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Granted: 1981-06-30
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Expires: 1999-07-18
Abstract
Abstract A multiple coil electromagnetic pickup converts into signals the flux varions produced by the passing of the teeth of a sound wheel. The pickup comprises at least two assemblies each consisting of at least one coil, one pole piece and one straight magnet all axially aligned, the assemblies being arranged in parallel to each other and magnetically insulated from each other by a screen. Measurement of rotational speed produces two output signals.
Inventors
- 👤 Sylvain M. Dron
- 👤 Gerard M. G. Evrard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:44
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/488
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
An electromagnetic sensor comprising at least a pair of coils, each coil being part of an assembly comprising an axial arrangement of a coil and a straight magnet arranged end to end, said assemblies being parallel to each other, the magnet poles of the same polarity extending in the same direction, only the coil of each assembly being housed in a solid piece of a magnetic material, each magnet being in an essentially tubular non-magnetic housing.
Claim 2
Dependent Claim
76 words
An electromagnetic sensor comprising at least a pair of coils, each coil being part of an assembly comprising an axial arrangement of a coil and a straight magnet arranged end to end, said assemblies being parallel to each other, the magnet poles of the same polarity extending in the same direction, only the coil of each assembly being housed in a solid piece of a magnetic material, each magnet being in an essentially tubular non-magnetic housing.
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) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |