US4310381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for improving magnetic properties of metallic glass ribbon
Assignee: Honeywell International Inc
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Filing: 1980-04-04
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Granted: 1982-01-12
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Expires: 2000-04-04
Abstract
Abstract The soft magnetic properties of metallic glass ribbon are improved by removing at least a part of the surface before annealing. The magnetic alloy ribbon is prepared by chill block casting, after which the regions of the ribbon surface that adjoined but did not contact the chill block are removed. After being wound into a toroidal core and annealed, the material shows lower coercive force and core loss and higher remanence as compared with material from whose surface the out-of-contact regions were not removed.
Inventors
- 👤 Nicholas J. DeCristofaro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:50
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15341; C; C21; C21D; C21D1/00; C21D1/04; C21D6/00; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/28; C21D2261/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
36 words
A method for improving the magnetic properties of chill-block-cast, ferromagnetic metallic glass ribbon comprising substantially removing, prior to annealing, the regions of the ribbon surface that adjoined, but did not contact, the chill block during quenching.
Claim 2
Independent Claim
36 words
A method for improving the magnetic properties of chill-block-cast, ferromagnetic metallic glass ribbon comprising substantially removing, prior to annealing, the regions of the ribbon surface that adjoined, but did not contact, the chill block during quenching.
Claim 3
Dependent Claim
17 words
The method of claim 1 in which at least about 1% by weight of ribbon is removed.
Claim 4
Dependent Claim
17 words
The method of claim 2 in which at least about 5% by weight of ribbon is removed.
Claim 5
Dependent Claim
26 words
The method of claim 1 in which the removal is accomplished by contacting at least the bottom surface of the ribbon with a chemical etchant liquid.
Claim 6
Dependent Claim
15 words
The method of claim 4 in which the etchant comprises a dilute nitric acid solution.
Claim 7
Dependent Claim
22 words
The method of claim 5 in which the etchant comprises a solution of ferric chloride and ammonium bisulfate in dilute nitric acid.
References Cited (Backward Citations)
US1998840A
Cited
US3607462A
Cited
FR2076195A5
Cited
US3870574A
Cited
SU574779A1
Cited
US4154283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-11 | 1985-07-13 | 1986-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-11 | 1989-07-13 | 1990-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-11 | 1993-07-13 | 1994-01-12 | $7700.00 | Window Closed / Lapsed |