US3784945A
Expired / Lapsed
US
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Permanent magnet for suspension bearings
Assignee: Individual
•
Filing: 1973-02-07
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Granted: 1974-01-08
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Expires: 1993-02-07
Abstract
Abstract A permanent magnet is formed from a mixture of powdered permanent magnet material and a synthetic resin binder. The magnet includes first and second layers. One layer has a coercivity substantially greater than the second layer.
Inventors
- 👤 M Baermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:53
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/0408; F16C32/0423; F16C32/0427; G; G01; G01R; G01R1/00; G01R1/02; G01R1/16; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06; H01F1/08; H01F1/083; H01F1/10; H01F1/11; H01F1/113; H01F7/00; H01F7/02; H01F7/0205; H01F7/021; H01F7/0231; H01F7/0236; F16C2370/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
21 words
The magnet of claim 1 wherein said first layer has a thickness substantially less than the thickness of said second layer.
Claim 2
Dependent Claim
15 words
The magnet of claim 2 wherein said first layer has a permeability of substantially unity.
Claim 3
Dependent Claim
17 words
The magnet of claim 3 wherein said first layer has a coercivity of at least 1,600 oersted.
Claim 4
Dependent Claim
19 words
The magnet of claim 4 wherein said second layer hAs a small variation in induction with fluctuations in temperature.
Claim 5
Dependent Claim
21 words
The magnet of claim 1 wherein said first layer has a thickness substantially less than the thickness of said second layer.
Claim 6
Dependent Claim
17 words
The magnet of claim 1 wherein said first layer has a coercivity of at least 1,600 oersted.
Claim 7
Dependent Claim
15 words
The magnet of claim 1 wherein said first layer has a permeability of substantially unity.
Claim 8
Dependent Claim
22 words
The magnet of claim 1 wherein said second layer has a thickness at least three times the thickness of said first layer.
Claim 9
Dependent Claim
18 words
The magnet of claim 1 wherein said first and second layers are molded together into a unitary mass.
Claim 10
Dependent Claim
46 words
The magnet of claim 1 and including an additional magnet to provide a pair of magnets, said pair of magnets being positionable in an electricity meter to provide a magnetic suspension bearing with said first layers of said magnets facing one another across an air gap.
Claim 11
Dependent Claim
19 words
The magnet of claim 1 wherein said second layer includes powdered permanent magnet material comprising an alloy of iron.
Claim 12
Dependent Claim
15 words
The magnet of claim 12 wherein said first layer includes non-metallic powdered permanent magnet material.
Claim 13
Dependent Claim
15 words
The magnet of claim 1 wherein said first layer includes non-metallic powdered permanent magnet material.
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |