US3744041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic thin film memory elements and method of manufacturing the same
Assignee: Toshiba Corp
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Filing: 1970-07-28
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Granted: 1973-07-03
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Expires: 1990-07-28
Abstract
Abstract A magnetic thin film memory element including word lines and digit lines spatially intersecting at right angles is prepared by continuously forming the digit line unit on a heat resistant flexible insulator sheet, and perfectly contacting the digit line unit to a separately prepared word line unit.
Inventors
- 👤 N Yasuda
- 👤 T Ogawa
- 👤 S Takeno
- 👤 I Higashinakagawa
- 👤 T Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:49
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/04; G11C11/14; G11C11/15; G11C11/16; G11C11/21; G11C11/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
141 words
A magnetic thin film memory device using a heat resistant flexible insulator sheet comprising: a word linE unit including a plurality of word lines arranged in parallel with each other, and a magnetic keeper coupled to said word lines for concentrating a magnetic field immediately below said word lines; a flexible digit line unit including a heat resistant flexible insulator sheet formed of polyimide resin film, a plurality of digit lines arranged in parallel with each other on one face of said polyimide resin film, an anisotropic magnetic thin film surrounding said digit lines to form closed flux paths, and a conductor layer deposited on the other face of said polyimide resin film, and means for connecting together said word and digit line units with said digit lines orthogonal to said word lines to form memory cells at their crossing points.
Claim 2
Dependent Claim
141 words
A magnetic thin film memory device using a heat resistant flexible insulator sheet comprising: a word linE unit including a plurality of word lines arranged in parallel with each other, and a magnetic keeper coupled to said word lines for concentrating a magnetic field immediately below said word lines; a flexible digit line unit including a heat resistant flexible insulator sheet formed of polyimide resin film, a plurality of digit lines arranged in parallel with each other on one face of said polyimide resin film, an anisotropic magnetic thin film surrounding said digit lines to form closed flux paths, and a conductor layer deposited on the other face of said polyimide resin film, and means for connecting together said word and digit line units with said digit lines orthogonal to said word lines to form memory cells at their crossing points.
Claim 3
Dependent Claim
15 words
The memory device according to claim 1 wherein said magnetic keeper covers said word lines.
Claim 4
Dependent Claim
17 words
The memory device according to claim 1 wherein said polyimide resin film is about 25 microns thick.
Claim 5
Dependent Claim
169 words
A magnet thin film memory device using a heat resistant flexible insulator sheet comprising: a word line unit including a magnetic keeper board made of ferrite, a plurality of word lines deposited one one face of said keeper and arranged in parallel with each other, and an insulating resin layer covering said word lines and covering portions of said one face of said keeper which are not deposited with said word lines; a flexible digit line unit including a heat resistant flexible insulator sheet formed of polyimide resin film, a plurality of digit lines deposited on one face of said polyimide resin film, an anisotropic magnetic thin film surrounding said digit lines to form closed flux paths, and a conductor layer deposited on the other face of said polymide resin film, said digit lines being arranged in parallel with each other; and means for connecting together said word and digit line units with said digit lines orthogonal to said word lines to form memory cells at their crossing points.
Claim 6
Dependent Claim
169 words
A magnet thin film memory device using a heat resistant flexible insulator sheet comprising: a word line unit including a magnetic keeper board made of ferrite, a plurality of word lines deposited one one face of said keeper and arranged in parallel with each other, and an insulating resin layer covering said word lines and covering portions of said one face of said keeper which are not deposited with said word lines; a flexible digit line unit including a heat resistant flexible insulator sheet formed of polyimide resin film, a plurality of digit lines deposited on one face of said polyimide resin film, an anisotropic magnetic thin film surrounding said digit lines to form closed flux paths, and a conductor layer deposited on the other face of said polymide resin film, said digit lines being arranged in parallel with each other; and means for connecting together said word and digit line units with said digit lines orthogonal to said word lines to form memory cells at their crossing points.
Claim 7
Dependent Claim
114 words
The memory device according to claim 4 wherein said polyimide resin film is about 25 microns thick. a flexible digit line unit including a heat resistant flexible insulator sheet formed of polimide resin film, a plurality of digit lines deposited on one face of said polyimide resin film, an anisotropic magnetic thin film surrounding said digit lines to form closed flux paths, and a conductor layer deposited on the other face of said polyimide resin film, said digit lines being arranged in parallel with each other; and means for connecting together said word and digit line units with said digit lines orthogonal to said word lines to form memory cells at their crossing points.
Claim 8
Dependent Claim
158 words
A magnetic thin film memory device using a heat resistant flexible insulator sheet comprising: a word line unit including a glass substrate, a plurality of island shaped magnetic keepers deposited on that portion of said substrate corresponding to each bit storage location of said memory device, and a plurality of word lines arranged in parallel with each other on said keepers; a flexible digit line unit including a heat resistant flexible insulator sheet formed of polimide resin film, a plurality of digit lines deposited on one face of said polyimide resin film, an anisotropic magnetic thin film surrounding said digit lines to form closed flux paths, and a conductor layer deposited on the other face of said polyimide resin film, said digit lines being arranged in parallel with each other; and means for connecting together said word and digit line units with said digit lines orthogonal to said word lines to form memory cells at their crossing points.
Claim 9
Dependent Claim
158 words
A magnetic thin film memory device using a heat resistant flexible insulator sheet comprising: a word line unit including a glass substrate, a plurality of island shaped magnetic keepers deposited on that portion of said substrate corresponding to each bit storage location of said memory device, and a plurality of word lines arranged in parallel with each other on said keepers; a flexible digit line unit including a heat resistant flexible insulator sheet formed of polimide resin film, a plurality of digit lines deposited on one face of said polyimide resin film, an anisotropic magnetic thin film surrounding said digit lines to form closed flux paths, and a conductor layer deposited on the other face of said polyimide resin film, said digit lines being arranged in parallel with each other; and means for connecting together said word and digit line units with said digit lines orthogonal to said word lines to form memory cells at their crossing points.
Claim 10
Dependent Claim
17 words
The memory device according to claim 6 wherein said polyimide resin film is about 25 microns thick.
References Cited (Backward Citations)
US3456247A
Cited
US3483534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |