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US3755796A
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Cobalt-platinum group alloys whose anisotrophy is greater than their demagnetizable field for use as cylindrical memory elements
Assignee: International Business Machines Corp
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Filing: 1971-06-30
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Granted: 1973-08-28
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Expires: 1991-06-30
Overview & Biblio
Claims (9)
Citations (6)
Maintenance Schedule (3)
Categories & Tags (0)
Abstract
Abstract A magnetic cylindrical domain memory element and array comprising a ferro-magnetic, metallic, cobalt base, hexagonal, single crystal alloy having anisotropic characteristics, means for creating magnetic domains in the alloy and means for maintaining and manipulating the domains in the alloy. The alloy is composed of more then 50 percent cobalt and contains an addition element depressing the saturation magnetization field of the cobalt, but stabilizing the hexagonal phase of the cobalt to a higher temperature. This improvement is achieved without materially changing the magneto-crystalline anisotropy inherent in the hexagonal cobalt structure. The addition elements include ruthenium, rhenium, osmium, rhodium, iridium, silicon, germanium, arsenic, and platinum.
Inventors
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:02
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/12; H01F10/16; G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; H01F10/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
23 words
The memory of claim 1 wherein said alloy consists essentially of cobalt and more than zero but less than 4 atomic percent arsenic.
Claim 2
Dependent Claim
24 words
The memory of claim 1 wherein said alloy consists essentially of cobalt and more than zero but less than 10 atomic percent of germanium.
Claim 3
Dependent Claim
23 words
The memory of claim 1 wherein said alloy consists essentially of cobalt and between 2.8 atomic percent and 40 atomic percent of iridium.
Claim 4
Dependent Claim
23 words
The memory of claim 1 wherein said alloy consists essentially of cobalt and between 2.8 atomic percent and 40 atomic percent of osmium.
Claim 5
Dependent Claim
21 words
The memory of claim 1 wherein said alloy consists essentially of cobalt and between 5 - 25 atomic percent of platinum.
Claim 6
Dependent Claim
21 words
The memory of claim 1 wherein said alloy consists essentially of cobalt and between 5 - 25 atomic percent of rhenium.
Claim 7
Dependent Claim
20 words
The memory of claim 1 where said alloy consists of cobalt and between 5 - 50 atomic percent of rhodium.
Claim 8
Dependent Claim
21 words
The memory of claim 1 wherein said alloy consists essentially of cobalt and between 3.6 - 35 atomic percent of ruthenium.
Claim 9
Dependent Claim
21 words
The memory of claim 1 wherein said alloy consists essentially of cobalt and between 3.6 - 12 atomic percent of silicon.
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) 1976-08-27
1977-02-26 1977-08-28
$2000.00
Window Closed / Lapsed
7.5 Years (Year 8) 1980-08-27
1981-02-26 1981-08-28
$3760.00
Window Closed / Lapsed
11.5 Years (Year 12) 1984-08-27
1985-02-26 1985-08-28
$7700.00
Window Closed / Lapsed