Patent US3920409A successfully refreshed from Google Patents.
US3920409A
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Plated ferromagnetic wire for wire memory
Assignee: Hitachi Ltd
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Filing: 1972-06-19
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Granted: 1975-11-18
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Expires: 1992-06-19
Abstract
Abstract Plated ferromagnetic wire for wire memory, in which silvercopper alloy having precipitation-hardening property is used as the core wire. A method for manufacturing the plated ferromagnetic wire, wherein the core wire is heat-treated and coated with at least one layer of ferromagnetic material.
Inventors
- 👤 Satoshi Taniguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:08
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/04; B21C37/042; B21F; B21F19/00; H; H01; H01F; H01F10/00; H01F10/06; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/928; Y10S428/9335; Y10S428/934; Y10S428/935; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12896; Y10T428/12903; Y10T428/1291; Y10T428/12986
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
103 words
A PLATED FERROMAGNETIC WIRE USABLE AS A MEMORY ELEMENT COMPRISING A CORE WIRE CONSISTING ESSENTIALLY OF A COPPER-SILVER BINARY ALLOY CONTAINING FROM 0.2 TO 10 ATOMIC PERCENT OF SILVER, A LAYER OF COPPER UNIFORMLY FORMED ON THE SURFACE OF SAID CORE WIRE, A NON-MAGNETIC NICKEL LAYER UNIFORMLY ELECTROPLATED ON SAID LAYER OF COPPER, A LAYER OF A PERMALLOY UNIFORMLY ELECTROPLATED ON SAID NON-MAGNETIC NICKEL LAYER, A LAYER OF NICKEL-COBALT BINARY ALLOY UNIFORMLY ELECTROPLATED ON SAID LAYER OF A PERMALLOY, SAID LAYERS OF A PERMALLOY AND A NICKEL-COBALT BIALLOY HAVING, RESPECTIVELY, AN EASY AXIS OF MAGNETIZATION CIRCUMFERENTIAL ABOUT SAID CORE WIRE AND A PROTEC-
Claim 2
Dependent Claim
103 words
A PLATED FERROMAGNETIC WIRE USABLE AS A MEMORY ELEMENT COMPRISING A CORE WIRE CONSISTING ESSENTIALLY OF A COPPER-SILVER BINARY ALLOY CONTAINING FROM 0.2 TO 10 ATOMIC PERCENT OF SILVER, A LAYER OF COPPER UNIFORMLY FORMED ON THE SURFACE OF SAID CORE WIRE, A NON-MAGNETIC NICKEL LAYER UNIFORMLY ELECTROPLATED ON SAID LAYER OF COPPER, A LAYER OF A PERMALLOY UNIFORMLY ELECTROPLATED ON SAID NON-MAGNETIC NICKEL LAYER, A LAYER OF NICKEL-COBALT BINARY ALLOY UNIFORMLY ELECTROPLATED ON SAID LAYER OF A PERMALLOY, SAID LAYERS OF A PERMALLOY AND A NICKEL-COBALT BIALLOY HAVING, RESPECTIVELY, AN EASY AXIS OF MAGNETIZATION CIRCUMFERENTIAL ABOUT SAID CORE WIRE AND A PROTEC-
Claim 3
Dependent Claim
74 words
A memory element comprising a core component consisting essentially of a copper-silver binary alloy containing from 0.2 to 99.5 atomic percent of silver, a copper layer electroplated on the surface of said core component, a non-magnetic nickel layer electroplated on the surface of said copper layer, a layer of ferromagnetic material uniformly electroplated on the surface of said non-magnetic nickel layer, and a protective coating Of non-magnetic material on said layer of ferromagnetic material.
Claim 4
Dependent Claim
74 words
A memory element comprising a core component consisting essentially of a copper-silver binary alloy containing from 0.2 to 99.5 atomic percent of silver, a copper layer electroplated on the surface of said core component, a non-magnetic nickel layer electroplated on the surface of said copper layer, a layer of ferromagnetic material uniformly electroplated on the surface of said non-magnetic nickel layer, and a protective coating Of non-magnetic material on said layer of ferromagnetic material.
Claim 5
Dependent Claim
48 words
A memory element according to claim 2 wherein said layer of ferromagnetic material comprises a composite layer comprising a layer of permalloy electroplated on the surface of said non-magnetic nickel layer and a layer of a nickel-cobalt binary alloy electroplated on the surface of said layer of permalloy.
Claim 6
Dependent Claim
23 words
A plated ferromagnetic memory element according to claim 2; wherein said copper-silver binary alloy consists of 0.2 to 10 atomic percent of silver.
Claim 7
Dependent Claim
62 words
A MEMORY ELEMENT COMPRISING A CORE COMPONENT CONSISTING OF COPPER-SILVER BINARY ALLOY CONSISTING 0.2 TO 99.5 ATOMIC PERCENT OF SILVER, A COPPER LAYER ELECTROPLATED ON THE SURFACE OF SAID CORE COMPONENT, A NON-MAGNETIC NICKEL LAYER ELECTROPLATED ON THE SURFACE OF SAID COPPER LAYER AND AT LEAST ONE LAYER OF A FERROMAGNETIC MATERIAL UNIFORMLY ELECTROPLATED ON THE SURFACE OF SAID NON-MAGNETIC NICKEL LAYER.
Claim 8
Dependent Claim
62 words
A MEMORY ELEMENT COMPRISING A CORE COMPONENT CONSISTING OF COPPER-SILVER BINARY ALLOY CONSISTING 0.2 TO 99.5 ATOMIC PERCENT OF SILVER, A COPPER LAYER ELECTROPLATED ON THE SURFACE OF SAID CORE COMPONENT, A NON-MAGNETIC NICKEL LAYER ELECTROPLATED ON THE SURFACE OF SAID COPPER LAYER AND AT LEAST ONE LAYER OF A FERROMAGNETIC MATERIAL UNIFORMLY ELECTROPLATED ON THE SURFACE OF SAID NON-MAGNETIC NICKEL LAYER.
Claim 9
Dependent Claim
88 words
A plated ferromagnetic wire useable as a memory element comprising a core wire consisting of a copper-silver binary alloy containing 0.2 to 99.5 atomic percent of silver; a copper layer plated on said core wire; a non-magnetic nickel layer plated on said copper layer; a composite ferromagnetic layer plated on said non-magnetic nickel layer, said composite ferromagnetic layer comprising at least one layer of permalloy and at least one layer of a nickel-cobalt binary alloy; and a protective coating layer of non-magnetic material on said composite ferromagnetic layer.
Claim 10
Dependent Claim
88 words
A plated ferromagnetic wire useable as a memory element comprising a core wire consisting of a copper-silver binary alloy containing 0.2 to 99.5 atomic percent of silver; a copper layer plated on said core wire; a non-magnetic nickel layer plated on said copper layer; a composite ferromagnetic layer plated on said non-magnetic nickel layer, said composite ferromagnetic layer comprising at least one layer of permalloy and at least one layer of a nickel-cobalt binary alloy; and a protective coating layer of non-magnetic material on said composite ferromagnetic layer.
Claim 11
Dependent Claim
22 words
A plated ferromagnetic wire according to claim 6, wherein said copper-silver binary alloy consists of 0.2 to 10 atomic percent of silver.
Claim 12
Dependent Claim
28 words
A memory element according to claim 6 wherein said layer of ferromagnetic material comprises alternate layers of permalloy and a nickel-cobalt binary alloy alternately electroplated on each other.
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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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |