Patent US4040971A successfully refreshed from Google Patents.
US4040971A
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Magnetic wedge
Assignee: Westinghouse Electric Corp
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Filing: 1976-01-06
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Granted: 1977-08-09
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Expires: 1996-01-06
Abstract
Abstract A magnetic wedge is made by preparing a composition of a thermosetting resin system and magnetizable particles, placing the composition in a mold, vibrating the mold at least until air bubbles are no longer evolved from the composition, curing the composition, and fabricating the lower portion of the cured composition into the shape desired for the wedge. The vibration removes air and compacts the particles which results in a wedge having overall superior physical and magnetic properties.
Inventors
- 👤 Leonard B. Simmonds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:20
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/13; H02K3/00; H02K3/46; H02K3/48; H02K3/487; H02K3/493
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
39 words
A magnetic wedge comprising a cured thermosetting resin system containing about 65 to about 75% by volume elongated magnetizable particles orientated in the direction of said wedge and having a length to diameter ratio of at least about 250.
Claim 2
Dependent Claim
39 words
A magnetic wedge comprising a cured thermosetting resin system containing about 65 to about 75% by volume elongated magnetizable particles orientated in the direction of said wedge and having a length to diameter ratio of at least about 250.
Claim 3
Dependent Claim
12 words
A magnetic wedge according to claim 1 wherein said particles are iron.
Claim 4
Dependent Claim
21 words
A magnetic wedge according to claim 2 wherein said particles are about 80 to about 90% by weight of said wedge.
Claim 5
Dependent Claim
26 words
A magnetic wedge according to claim 12 wherein said thermosetting resin system comprises a resin selected from the group consisting of epoxy resins and polyester resins.
Claim 6
Dependent Claim
16 words
A magnetic wedge according to claim 1 wherein said thermosetting resin system comprises an epoxy resin.
Claim 7
Dependent Claim
20 words
A magnetic wedge according to claim 1 wherein said resin system includes about 0.5 to about 1.5% of a flexibilizer.
Claim 8
Dependent Claim
13 words
A magnetic wedge according to claim 6 wherein said flexibilizer is polypropylene glycol.
Claim 9
Dependent Claim
12 words
A magnetic wedge according to claim 1 wherein said particles are iron.
Claim 10
Dependent Claim
22 words
A magnetic wedge according to claim 1 wherein said elongated particles are about 0.0003 inches in diameter and about 0.075 inches long.
References Cited (Backward Citations)
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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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |