US5084690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stepped magnetic field source
Assignee: United States Department of the Army
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Filing: 1991-04-29
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Granted: 1992-01-28
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Expires: 2011-04-29
Abstract
Abstract An improved permanent magnet solenoid having a stepped transition in axialagnetic field profile and comprised of two permanent magnet solenoids, with appropriate cladding, placed in tandem and a radially magnetized ring magnet placed within the working cavity of the solenoids at the joint of entire structure.
Inventors
- 👤 Herbert A. Leupold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:17
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/08; H01J23/087; H01F; H01F7/00; H01F7/02; H01F7/0273; H01F7/0278
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
195 words
A permanent magnet solenoid for the generation of a stepped magnetic field comprising a first hollow cylindrical magent having a uniform magnetization oriented in a direction along a longitudinal axis of said first cylindrical magnet, a first cladding means disposed around the first cylindrical magnet such that the cladding means reduces the amount of magnetic flux leakage from the permanent magnet solenoid, a second hollow cylindrical magnet having a uniform magnetization oriented in a direction along the longitudinal axis of said first cylindrical magnet and in the same direction as said first cylindrical magnet, the second cylindrical magnet being connected at an end of the first magnet forming a joint therebetween and a working cavity, and cladding means disposed around the second cylindrical magnet such that the cladding mans reduces the amount of magnetic flux leakage from the permanent magnet solenoid, the improvement comprising: a radially magnetized magnetic ring connected to said first and second cylindrical magnets in the interior of the working cavity and at the joint of the permanent magent solenoid; and a plurality of axially magnetized rings positioned at predetermined locations to adjust for variations in remanence o the permanent magnet solenoid.
Claim 2
Dependent Claim
195 words
A permanent magnet solenoid for the generation of a stepped magnetic field comprising a first hollow cylindrical magent having a uniform magnetization oriented in a direction along a longitudinal axis of said first cylindrical magnet, a first cladding means disposed around the first cylindrical magnet such that the cladding means reduces the amount of magnetic flux leakage from the permanent magnet solenoid, a second hollow cylindrical magnet having a uniform magnetization oriented in a direction along the longitudinal axis of said first cylindrical magnet and in the same direction as said first cylindrical magnet, the second cylindrical magnet being connected at an end of the first magnet forming a joint therebetween and a working cavity, and cladding means disposed around the second cylindrical magnet such that the cladding mans reduces the amount of magnetic flux leakage from the permanent magnet solenoid, the improvement comprising: a radially magnetized magnetic ring connected to said first and second cylindrical magnets in the interior of the working cavity and at the joint of the permanent magent solenoid; and a plurality of axially magnetized rings positioned at predetermined locations to adjust for variations in remanence o the permanent magnet solenoid.
Claim 3
Independent Claim
53 words
A method of correcting alternating remanence values within permanent magnet structures comprising the steps of: a. fabricating a hollow permanent magnet structure, b. determining variations of magnetic remanence within the permanent magnet structure, c. placing axially magnetized rings at predetermined locations to adjust for the variations in remanence of the permanent magnet structure.
Claim 4
Independent Claim
53 words
A method of correcting alternating remanence values within permanent magnet structures comprising the steps of: a. fabricating a hollow permanent magnet structure, b. determining variations of magnetic remanence within the permanent magnet structure, c. placing axially magnetized rings at predetermined locations to adjust for the variations in remanence of the permanent magnet structure.
References Cited (Backward Citations)
US3334264A
Cited
US5055812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-27 | 1995-07-29 | 1996-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-27 | 1999-07-29 | 2000-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-27 | 2003-07-29 | 2004-01-28 | $7700.00 | Window Closed / Lapsed |