US4555685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formed permanent magnet
Assignee: I Pex Inc
•
Filing: 1984-11-29
•
Granted: 1985-11-26
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Expires: 2004-11-29
Abstract
Abstract A formed permanent magnet which comprises a base made of magnetic material and having gaps with a predetermined width formed between portions thereof serving to form magnetic poles and which is formed by magnetizing those portions serving to form magnetic poles, the formed permanent magnet ensuring high accuracy in the distance between respective magnetic poles.
Inventors
- 👤 Ryozi Maruyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:10
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/02; H01F7/0205; H01F7/021
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
67 words
A formed permanent magnet used as a sensor comprising a base having a plurality of gaps with a predetermined width formed between portions of said gaps serving to form magnetic poles and having a predetermined width, said base being injection molded with a material including a synthetic resin mixed with a magnetic material, said portions between said gaps being magnetized as N poles and S poles, alternately.
Claim 2
Dependent Claim
67 words
A formed permanent magnet used as a sensor comprising a base having a plurality of gaps with a predetermined width formed between portions of said gaps serving to form magnetic poles and having a predetermined width, said base being injection molded with a material including a synthetic resin mixed with a magnetic material, said portions between said gaps being magnetized as N poles and S poles, alternately.
Claim 3
Dependent Claim
19 words
A formed permanent magnet according to claim 1 wherein said base is magnetized after giving anisotropy to said base.
Claim 4
Dependent Claim
25 words
A formed permanent magnet according to claim 1 wherein said base is formed as a disk-type member having said gaps equally spaced in circumferential direction.
Claim 5
Dependent Claim
25 words
A formed permanent magnet according to claim 2 wherein said base is formed as a disk-type member having said gaps equally spaced in circumferential direction.
Claim 6
Dependent Claim
36 words
A formed permanent magnet according to claim 1 wherein said base is formed as a rectangular parallelepiped member having said gaps formed in the direction at a right angle to the longitudinal direction of said base.
Claim 7
Dependent Claim
36 words
A formed permanent magnet according to claim 2 wherein said base is formed as a rectangular parallelepiped member having said gaps formed in the direction at a right angle to the longitudinal direction of said base.
Claim 8
Dependent Claim
22 words
A formed permanent magnet according to claim 1 wherein said base is formed as a disk-type member having said gaps extending radially.
Claim 9
Dependent Claim
22 words
A formed permanent magnet according to claim 2 wherein said base is formed as a disk-type member having said gaps extending radially.
Claim 10
Dependent Claim
37 words
A formed permanent magnet according to claim 1 wherein said base is formed as a disk-type member having through holes which extend radially and, at the same time, which are formed as through holes in axial direction.
Claim 11
Dependent Claim
37 words
A formed permanent magnet according to claim 2 wherein said base is formed as a disk-type member having through holes which extend radially and, at the same time, which are formed as through holes in axial direction.
Claim 12
Dependent Claim
36 words
A formed permanent magnet according to claim 1 wherein said base is formed as a rectangular parallelepiped member having through holes extending in the direction at a right angle to the longitudinal direction of said base.
Claim 13
Dependent Claim
36 words
A formed permanent magnet according to claim 2 wherein said base is formed as a rectangular parallelepiped member having through holes extending in the direction at a right angle to the longitudinal direction of said base.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |