US4487812A
Expired / Lapsed
US
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Magnetic amorphous alloy sheet having a film thereon
Assignee: Nippon Steel Corp
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Filing: 1983-07-15
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Granted: 1984-12-11
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Expires: 2003-07-15
Abstract
Abstract The present invention relates to a magnetic amorphous alloy sheet having an improved insulating property and improved corrosion resistance. The present invention aims to provide a film which is used to cover the magnetic amorphous alloy sheet, thereby improving its corrosion resistance and increasing the layer insulation resistance, without impairing the magnetic properties. The film according to the present invention has a thickness of up to 1 mu m and comprises a chromium compound which comprises hydrated chromium oxide. The film may additionally comprises metallic chromium. The magnetic amorphous alloy according to the present invention is suitable for use as a transformer core achieving a high building factor.
Inventors
- 👤 Hironobu Kawasaki
- 👤 Takashi Sato
- 👤 Tomohiko Hayashi
- 👤 Tsutomu Ozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:05
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/38; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15383; H01F3/00; H01F3/02; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/12; Y10T428/12431; Y10T428/12438; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12549; Y10T428/12583; Y10T428/1259; Y10T428/12611
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
49 words
A magnetic amorphous alloy sheet having an improved insulating property and an improved corrosion resistance, wherein the improvement comprises a film having a maximum thickness of 1 μm disposed on and covering the surface of said magnetic amorphous alloy sheet wherein said film consists essentially of hydrated chromium oxide.
Claim 2
Dependent Claim
49 words
A magnetic amorphous alloy sheet having an improved insulating property and an improved corrosion resistance, wherein the improvement comprises a film having a maximum thickness of 1 μm disposed on and covering the surface of said magnetic amorphous alloy sheet wherein said film consists essentially of hydrated chromium oxide.
Claim 3
Dependent Claim
22 words
A magnetic amorphous alloy sheet according to claim 1, wherein said film has a thickness of from 0.005 μm to 0.5 μm.
Claim 4
Dependent Claim
21 words
A magnetic amorphous alloy sheet according to claim 1, wherein said film is formed by the process of cathodic electrolytic deposition.
Claim 5
Dependent Claim
31 words
A magnetic amorphous alloy sheet according to claim 1, wherein said film is formed by the process of immersing said magnetic amorphous alloy sheet in an aqueous solution containing chromium ions.
Claim 6
Dependent Claim
52 words
A magnetic amorphous alloy sheet having an improved insulating property and an improved corrosion resistance, wherein the improvement comprises a film having a maximum thickness of 1 μm disposed on and covering the surface of said magnetic amorphous alloy sheet wherein said film consists essentially of hydrated chromium oxide and metallic chromium.
Claim 7
Dependent Claim
52 words
A magnetic amorphous alloy sheet having an improved insulating property and an improved corrosion resistance, wherein the improvement comprises a film having a maximum thickness of 1 μm disposed on and covering the surface of said magnetic amorphous alloy sheet wherein said film consists essentially of hydrated chromium oxide and metallic chromium.
Claim 8
Dependent Claim
22 words
A magnetic amorphous alloy sheet according to claim 5, wherein said film has a thickness of from 0.005 μm to 0.5 μm.
Claim 9
Dependent Claim
21 words
A magnetic amorphous alloy sheet according to claim 5, wherein said film is formed by the process of cathodic electrolytic deposition.
Claim 10
Dependent Claim
33 words
A magnetic amorphous alloy sheet according to claim 5, wherein said film is formed by the cathodic electrolytic process of immersing said magnetic amorphous alloy sheet in an aqueous solution containing chromium ions.
Claim 11
Dependent Claim
47 words
A core of a transformer comprising at least one magnetic amorphous alloy sheet, wherein the improvement comprises a film having a maximum thickness of 1 μm disposed on and covering the surface of said magnetic amorphous alloy sheet wherein said film consists essentially of hydrated chromium oxide.
Claim 12
Dependent Claim
47 words
A core of a transformer comprising at least one magnetic amorphous alloy sheet, wherein the improvement comprises a film having a maximum thickness of 1 μm disposed on and covering the surface of said magnetic amorphous alloy sheet wherein said film consists essentially of hydrated chromium oxide.
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) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |