US3829372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer magnetic structure and methods of making same
Assignee: International Business Machines Corp
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Filing: 1972-05-25
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Granted: 1974-08-13
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Expires: 1992-05-25
Abstract
Abstract A MULTILAYER MAGNETIC STRUCTURE COMPRISING AT LEAST FOUR ALTERNATING LAYERS OF A MAGNETIC MATERIAL AND ITS OXIDE, UPON A SUBSTRATE, WHEREBY A DESIRED COMBINATION OF MAGNETIC PROPERTIES AND WEAR RESISTANCE IS ACHEIVED. A METHOD OF MAKING IS ALSO DISCLOSED. USES INCLUDE MAGNETIC DISK STORAGE APPLICATIONS.
Inventors
- 👤 J Heller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:20
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/14; H01F41/18; B; B82; B82Y; B82Y25/00; C; C23; C23C; C23C14/00; C23C14/0021; C23C14/0036; C23C14/0073; G; G11; G11B; G11B5/00; G11B5/84; G11B5/851; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |