US3671895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graded field magnets
Assignee: Thales SA
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Filing: 1970-04-27
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Granted: 1972-06-20
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Expires: 1990-04-27
Abstract
Abstract A lens effect is created at the entry to or the exit from, the airgap of a magnetic system by equipping the terminal faces of the polepieces thereof with ferromagnetic blocks, which are pivotally mounted on the output faces of the magnetic yoke so that the airgap has a variable width and a magnetic field gradient is produced. The upper face of the blocks may be sloped.
Inventors
- 👤 Jeanne Aucouturier
- 👤 Rene Lacaze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:30
CPC Classifications
G; G21; G21K; G21K1/00; G21K1/08; G21K1/093; H; H01; H01J; H01J29/00; H01J29/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A magnetic device for deflecting a beam of electrically charged particles, comprising two pairs of pole pieces defining two successive airgaps for receiving said beam, one airgap being constant and the other variable, means for creating magnetic fields in said airgaps for the propagation of said beam, one of said pairs of pole pieces being pivotally mounted on one of the end faces of the other said pair about an axis perpendicular to said end face, said other airgap being thus selectively variable as a function of the distance of the deflected beam from its center of curvature.
Claim 2
Dependent Claim
98 words
A magnetic device for deflecting a beam of electrically charged particles, comprising two pairs of pole pieces defining two successive airgaps for receiving said beam, one airgap being constant and the other variable, means for creating magnetic fields in said airgaps for the propagation of said beam, one of said pairs of pole pieces being pivotally mounted on one of the end faces of the other said pair about an axis perpendicular to said end face, said other airgap being thus selectively variable as a function of the distance of the deflected beam from its center of curvature.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |