Patent US3816909A successfully refreshed from Google Patents.
US3816909A
Expired / Lapsed
US
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Method of making a wire memory plane
Assignee: Resonac Corp
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Filing: 1972-05-30
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Granted: 1974-06-18
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Expires: 1992-05-30
Abstract
Abstract Disclosed is an improved wire memory plane, in which a memory matrix with a keeper is composed by perpendicularly arranging groups of word strips which comprise, on the back and two side surfaces of the word strip, a keeper made of a high magnetic permeability material and having a rectangular shape with one arm removed.
Inventors
- 👤 Y Maeda
- 👤 T Ueyama
- 👤 N Fukutomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:13
CPC Classifications
G; G11; G11C; G11C5/00; G11C5/06; G11C5/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49069
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
179 words
A method of making a wire memory plane, comprising the steps of forming a laminate consisting of an electrically conductive layer and a high magnetic permeability layer and an insulating flexible sheet in a sandwich structure with said conductive layer and said insulating sheet having exposed surfaces and sandwiching said magnetic layer therebetween, masking the conductive layer with a resist to form such a pattern that strips are arranged in parallel relation, using the same resist pattern and in the same etching step etching the electrically conductive layer and the high magnetic permeability layer to form a plurality of spaced conductors each having a magnetic strip associated therewith, depositing a high magnetic permeability material on the sides of the etched conductors and magnetic strips, then removing the strip-like pattern resist from the conductive layer to form word strips, and facing uncovered surfaces of the electrically conductive layer resulting from the preceding step to an insulating sheet into which digit lines are embedded in parallel relation to thereby form a matrix composed of the word strips and the digit lines.
Claim 2
Independent Claim
179 words
A method of making a wire memory plane, comprising the steps of forming a laminate consisting of an electrically conductive layer and a high magnetic permeability layer and an insulating flexible sheet in a sandwich structure with said conductive layer and said insulating sheet having exposed surfaces and sandwiching said magnetic layer therebetween, masking the conductive layer with a resist to form such a pattern that strips are arranged in parallel relation, using the same resist pattern and in the same etching step etching the electrically conductive layer and the high magnetic permeability layer to form a plurality of spaced conductors each having a magnetic strip associated therewith, depositing a high magnetic permeability material on the sides of the etched conductors and magnetic strips, then removing the strip-like pattern resist from the conductive layer to form word strips, and facing uncovered surfaces of the electrically conductive layer resulting from the preceding step to an insulating sheet into which digit lines are embedded in parallel relation to thereby form a matrix composed of the word strips and the digit lines.
Claim 3
Dependent Claim
15 words
The method according to claim 1, in which said electrically conductive layer is copper foil.
Claim 4
Dependent Claim
70 words
The method according to claim 1, wherein the step of depositing a high magnetic permeability material on the sides includes depositing the high magnetic permeability material on the resultant etched side portions of the electrically conductive layer and the high magNetic permeability layer such that the electrically conductive layer is surrounded on three sides thereof by high magnetic permeability material and has the pattern resist on the fourth side thereof.
Claim 5
Dependent Claim
43 words
The method according to claim 3, further including depositing the high magnetic permeability material on the side portions of the etched high magnetic permeability layer and electrically conductive layer so as to provide a spacing between adjacent side portions of the word strips.
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |