US3738865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing a magnetic thin film memory element
Assignee: Toshiba Corp
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Filing: 1970-07-30
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Granted: 1973-06-12
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Expires: 1990-07-30
Abstract
Abstract A MAGNETIC THIN FILM MEMORY IS FORMED BY SIMULTANEOUSLY ETCHING A FIRST MAGNETIC THIN FILM AND A CONDUCTOR FILM BOTH SUCCESSIVELY INTEGRATED ON A FLAT SUBSTRATE AS FAR AS TO THE SURFACE OF THE SUBSTRATE THEREBY TO FORM INTEGRATED STRIPS COMPRISED OF EQUALLY SPACED MAGNETIC AND CONDUCTIVE STRIPS, SELECTIVELY ETCHING THE CONDUCTIVE STRIPS BY AN ETCHANT CAPABLE OF ETCHING ONLY THE CONDUCTIVE STRIPS IN SUCH A MANNER THAT THEIR WIDTHS BECOME LESS THAN THE WIDTHS OF THE MAGNETIC STRIPS, AND ENTIRELY COVERING, AFTER REMOVAL OF THE PHOTO-RESIST, EACH OF THE CONDUCTIVE STRIPS WITH A MAGNETIC THIN FILM TO FORM A CLOSED FLUX PATH WITH SAID FIRST MAGNETIC THIN FILM.
Inventors
- 👤 S Takeno
- 👤 M Tashiro
- 👤 A Kasai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:11
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/32; H01F41/34; H01F10/00; H01F10/06
Claims Analysis
Total Claims: 0
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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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |