Patent US3831121A successfully refreshed from Google Patents.
US3831121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Focusing magnet
Assignee: Magna Tek Systems Inc
•
Filing: 1973-07-10
•
Granted: 1974-08-20
•
Expires: 1993-07-10
Abstract
Abstract An electromagnet pole piece structure having four or more pole pieces with the surface of each piece being a modified hyperboloid in the vicinity of the central magnetic focusing gap to improve field linearity, reduce variations in effective length at various angles and radii and minimize field distortions resulting from fringe effects at entrance and exit.
Inventors
- 👤 E Oster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:54
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/20; H01F7/202
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
57 words
A multiple pole magnet structure comprising a plurality of an even number greater than two of magnet poles having magnet coils coupled thereto and having pole tips substantially equally spaced apart about a magnet aperture, said pole tips each having a surface of revolution configuration facing an opposite pole tip with the axis of revolution being coincident.
Claim 2
Dependent Claim
57 words
A multiple pole magnet structure comprising a plurality of an even number greater than two of magnet poles having magnet coils coupled thereto and having pole tips substantially equally spaced apart about a magnet aperture, said pole tips each having a surface of revolution configuration facing an opposite pole tip with the axis of revolution being coincident.
Claim 3
Dependent Claim
17 words
The magnet structure of claim 1 further defined by said pole tips having a substantially hyperboloid configuration.
Claim 4
Dependent Claim
77 words
The magnet structure of claim 1 further defined by said pole tips being spaced from a central axis normal to an aperture plane having co-ordinate XY axes in such plane and the curvature of each of said pole tips being defined by the relationship XY Ka2/2 where a is the radial distance from said central axis to the pole tip and K is a correction constant of small value providing minor deviation from a true hyperboloid configuration.
Claim 5
Dependent Claim
39 words
A quadrupole magnet structure comprising four orthogonally disposed magnet poles having magnet coils coupled thereto and having the pole tips thereof spaced apart to define a magnet aperture, said pole tips having a substantially hyperboloid surface of revolution configuration.
Claim 6
Dependent Claim
39 words
A quadrupole magnet structure comprising four orthogonally disposed magnet poles having magnet coils coupled thereto and having the pole tips thereof spaced apart to define a magnet aperture, said pole tips having a substantially hyperboloid surface of revolution configuration.
Claim 7
Dependent Claim
61 words
The magnet structure of claim 4 further defined by the surface of each of said pole tips being spaced from a central axis normal to an aperture plane in a co-ordinate XY axis in such plane and parallel planes by substantially XY a2/2 where a is the radial distance from the central axis to the closest point on the pole tip.
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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |