US3685145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a batch fabricated magnetic wire memory
Assignee: Bunker Ramo Corp
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Filing: 1969-10-08
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Granted: 1972-08-22
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Expires: 1989-10-08
Abstract
Abstract A magnetic wire memory construction and method of making in which the memory comprises a plurality of stacked memory planes having memory wires inserted in aligned holes thereof. Each memory plane is fabricated using precision batch fabricated selective chemical etching techniques on a single self-supporting metal sheet so as to form pairs of insulated drive lines within the sheet looping around respective rows of a row-column matrix of memory wire receiving holes. Additional metal and magnetic layers may be provided over the surfaces of the sheets for increasing shielding and reducing memory cell disturbances.
Inventors
- 👤 Alfred D Scarbrough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:21
CPC Classifications
G; G11; G11C; G11C5/00; G11C5/02; G11C5/04; G11C11/00; G11C11/02; G11C11/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49069
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
193 words
A method of fabricating a memory plane from a conductive planar body, providing a self-supporting metal sheet for use as said conductive planar body, forming recesses in one surface of said planar body shaped so that said recesses contain raised conductive portions following paths respectively corresponding to the locations desired for drive lines to be provided for said plane, providing supporting dielectric material in said recesses between said conductive portions and said planar body, forming recesses in the other surface of said planar bodY respectively opposite those formed in said one surface and each having a location, width and depth relative to a respective opposite recess formed in said one surface so as to electrically isolate said raised conductive portions from each other and from said planar body and so as to thereby form insulated drive lines for said plane supported wholly within said planar body by said dielectric material, and forming memory element receiving holes in said planar body at predetermined locations of said recesses, said drive lines and said memory element receiving holes being located so that said drive lines form loops about respective groups of said memory element receiving holes.
Claim 2
Independent Claim
193 words
A method of fabricating a memory plane from a conductive planar body, providing a self-supporting metal sheet for use as said conductive planar body, forming recesses in one surface of said planar body shaped so that said recesses contain raised conductive portions following paths respectively corresponding to the locations desired for drive lines to be provided for said plane, providing supporting dielectric material in said recesses between said conductive portions and said planar body, forming recesses in the other surface of said planar bodY respectively opposite those formed in said one surface and each having a location, width and depth relative to a respective opposite recess formed in said one surface so as to electrically isolate said raised conductive portions from each other and from said planar body and so as to thereby form insulated drive lines for said plane supported wholly within said planar body by said dielectric material, and forming memory element receiving holes in said planar body at predetermined locations of said recesses, said drive lines and said memory element receiving holes being located so that said drive lines form loops about respective groups of said memory element receiving holes.
Claim 3
Dependent Claim
54 words
The invention in accordance with claim 1, wherein said raised conductive portions depend from the bottoms of the recesses formed in said one surface and rise a distance less than the distance to said one surface so that the resulting drive lines are wholly within said planar body and recessed from both surfaces thereof.
Claim 4
Dependent Claim
60 words
The invention in accordance with claim 2, wherein the recesses with raised conductive portions are formed in said one surface by first forming initial recesses having a depth corresponding to the outer surfaces of said raised conductive portions, and then removing material from selected portions of the bottoms of said initial recesses so as to form said raised conductive portions.
Claim 5
Dependent Claim
74 words
The invention in accordance with claim 2, wherein said receiving holes are arranged in rows, wherein the recesses in said one surface of the planar body are formed so as to interconnect and encircle the areas in respective rows corresponding to the locations at which said holes are to be formed, and wherein a pair of drive lines is provided for each row of holes with the drive lines passing on opposite sides thereof.
Claim 6
Dependent Claim
33 words
The invention in accordance with claim 1, wherein said method includes the additional step of providing a conductive layer adjacent and in electrical contact with at least one surface of said planar body.
Claim 7
Dependent Claim
30 words
The invention in accordance with claim 1, wherein said method includes the additional step of providing a magnetic layer adjacent at least one of the surfaces of said planar body.
Claim 8
Dependent Claim
20 words
The invention in accordance with claim 1, wherein said recesses and holes are formed using precision selective chemical etching techniques.
Claim 9
Dependent Claim
36 words
The invention in accordance with claim 1, wherein said method includes the additional steps of stacking a plurality of said planar bodies with their receiving holes aligned, and inserting memory wire elements into respective aligned holes.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |