Patent US3844909A successfully refreshed from Google Patents.
US3844909A
Expired / Lapsed
US
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Magnetic film plated wire and substrates therefor
Assignee: General Electric Co
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Filing: 1973-02-09
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Granted: 1974-10-29
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Expires: 1993-02-09
Abstract
Abstract A small diameter magnetic film plated wire for memory devices is constructed utilizing an inner core selected from the group consisting of tungsten and molybdenum. In a preferred embodiment of the magnetic film plated wire, a tungsten core is successively overlaid with a gold strike layer, a rapidly deposited relatively thick copper conductive layer, a slowly deposited smooth copper layer, a gold layer and a circumferentially oriented magnetic nickel-iron film.
Inventors
- 👤 R Mccary
- 👤 F Luborsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:31
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/14; H01F41/24; H01F41/26; B; B21; B21F; B21F19/00; Y; Y10; Y10S; Y10S205/00; Y10S205/922
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
THE METHOD OF MAKING MAGNETIC FILM PLATED WIRE FOR MEMORY DEVICES COMPRISING THE STEPS OF: ELECTROLYTICALLY DEPOSITING ON A GOLD CLAD WIRE, HAVING A CORE SELECTED FROM THE GROUP CONSISTING OF TUNGSTEN AND MOLYBDENUM, A FIRST COPPER LAYER TO PRODUCE A FIRST SURFACE, GEOMETRY; ELECTROLYTICALLY DEPOSITING ON SAID FIRST COPPER LAYER A SECOND COPPER LAYER TO PRODUCE A DIFFERENT SURFACE GEOMETRY FROM SAID FIRST SURFACE GEOMETRY; AND ELECTROLYTICALLY DEPOSITING ON SAID SECOND COPPER LAYER OF MAGNETIC FILM, SELECTED FROM THE GROUP CONSISTING OF NICKEL-IRON AND ALLOYS THEREOF.
Claim 2
Independent Claim
87 words
THE METHOD OF MAKING MAGNETIC FILM PLATED WIRE FOR MEMORY DEVICES COMPRISING THE STEPS OF: ELECTROLYTICALLY DEPOSITING ON A GOLD CLAD WIRE, HAVING A CORE SELECTED FROM THE GROUP CONSISTING OF TUNGSTEN AND MOLYBDENUM, A FIRST COPPER LAYER TO PRODUCE A FIRST SURFACE, GEOMETRY; ELECTROLYTICALLY DEPOSITING ON SAID FIRST COPPER LAYER A SECOND COPPER LAYER TO PRODUCE A DIFFERENT SURFACE GEOMETRY FROM SAID FIRST SURFACE GEOMETRY; AND ELECTROLYTICALLY DEPOSITING ON SAID SECOND COPPER LAYER OF MAGNETIC FILM, SELECTED FROM THE GROUP CONSISTING OF NICKEL-IRON AND ALLOYS THEREOF.
Claim 3
Dependent Claim
31 words
The method of making a magnetic film plated wire for memory devices as set forth in claim 1 wherein said first copper layer is deposited using a high deposition current density.
Claim 4
Dependent Claim
35 words
The method of making a magnetic film plated wire for memory devices as set forth in claim 2 wherein said first copper layer is deposited to a thickness of from approximately 0.25 to 0.50 mils.
Claim 5
Dependent Claim
35 words
The method of making a magnetic film plated wire for memory devices as set forth in claim 3 wherein said second copper layer is deposited to a thickness of from approximately 0.04 to 0.20 mils.
Claim 6
Dependent Claim
44 words
The method of making a magnetic film plated wire for memory devices as set forth in claim 4 wherein said second copper layer is deposited in an electrolytic bath containing organic additives by a low deposition current density to produce said different surface geometry.
Claim 7
Dependent Claim
47 words
The method of making a magnetic film plated wire for memory devices as set forth in claim 5 wherein the deposition time is the same at the high and low current densities so that the first and second copper layers can be produced on a continuous basis.
Claim 8
Dependent Claim
30 words
The method of making a magnetic film plated wire for memory devices as set forth in claim 2 wherein said high current density is on the order of 100 ma/cm2.
Claim 9
Dependent Claim
30 words
The method of making a magnetic film plated wire for memory devices as set forth in claim 5 wherein said low current density is on the order of 35 ma/cm2.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |