US3857734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manganese bismuth thin films on reactive substrates
Assignee: Honeywell Inc
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Filing: 1972-05-04
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Granted: 1974-12-31
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Expires: 1992-05-04
Abstract
Abstract Uniform magnetic thin films of manganese bismuth are produced on a nonmagnetic substrate capable of reacting with manganese, bismuth, or manganese bismuth. A thin passivating layer of oxidized aluminum covers the substrate and the manganese bismuth thin film overlays the thin passivating layer.
Inventors
- 👤 D Chen
- 👤 G Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:37
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/12; C; C23; C23C; C23C14/00; C23C14/02; C23C14/024; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
59 words
A MAGNETIC STORAGE ELEMENT COMPRISING: A NOMAGNETIC SUBSTRATE CAPABLE OF REACTING WITH MANGANESE, BISMUTH, OR MANGANESE BISMUTH, A THIN PASSIVATING LAYER OF OXIDIZED ALUMINUM OVER THE SUBSTRATE, AND A MANGANESE BISMUTH THIN FILM OVER THE THIN PASSIVATING LAYER, THE MANGANESE BISMUTH THIN FILM HAVING ITS PREFERRED MAGNETIZATION DIRECTION ORIENTED NORMAL TO THE PLANE OF THE MANGANESE BISMUTH THIN FILM.
Claim 2
Dependent Claim
59 words
A MAGNETIC STORAGE ELEMENT COMPRISING: A NOMAGNETIC SUBSTRATE CAPABLE OF REACTING WITH MANGANESE, BISMUTH, OR MANGANESE BISMUTH, A THIN PASSIVATING LAYER OF OXIDIZED ALUMINUM OVER THE SUBSTRATE, AND A MANGANESE BISMUTH THIN FILM OVER THE THIN PASSIVATING LAYER, THE MANGANESE BISMUTH THIN FILM HAVING ITS PREFERRED MAGNETIZATION DIRECTION ORIENTED NORMAL TO THE PLANE OF THE MANGANESE BISMUTH THIN FILM.
Claim 3
Dependent Claim
21 words
The magnetic storage element of claim 1 and further comprising an optically transparent protective layer over the manganese bismuth thin film.
Claim 4
Dependent Claim
19 words
The magnetic storage element of claim 2 wherein the optically transparent protective layer comprises a layer of silicon monoxide.
Claim 5
Dependent Claim
15 words
The magnetic storage element of claim 1 wherein the nonmagnetic substrate is a flexible film.
Claim 6
Dependent Claim
16 words
The magnetic storage element of claim 4 wherein the flexible film is a synthetic organic material.
Claim 7
Dependent Claim
17 words
The magnetic storage element of claim 5 wherein the synthetic organic material is a high temperature polyfluoroethylene.
Claim 8
Dependent Claim
24 words
The magnetic storage element of claim 1 wherein the thin passivating layer has a thickness of between about 100 angstroms and about 200 angstroms.
Claim 9
Dependent Claim
25 words
The magnetic storage element of claim 1 wherein the manganese bismuth thin film has a thickness of between about 100 angstroms and about 1,000 angstroms.
Claim 10
Dependent Claim
13 words
The magnetic storage element of claim 1 wherein the nonmagnetic substrate is metal.
References Cited (Backward Citations)
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US3470020A
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US3492158A
Cited
US3642533A
Cited
US3539383A
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US3619289A
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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) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |