US4387136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium and apparatus for preparing the same
Assignee: TDK Corp
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Filing: 1981-03-23
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Granted: 1983-06-07
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Expires: 2001-03-23
Abstract
Abstract A thin metallic layer type magnetic recording medium having thin metallic layers in a structure comprises a layer in which a tilt angle of a metallic particle direction to the normal line to said substrate gradually increases depending upon an increase of a distance from said substrate; and a layer in which a tilt angle of a metallic particle direction to the normal line to said substrate gradually decreases depending upon an increase of a distance from said substrate.
Inventors
- 👤 Seitoku Saito
- 👤 Fumio Maruta
- 👤 Toshiaki Izumi
- 👤 Hiroshi Sugihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:36
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/66; G11B5/674; G11B5/84; G11B5/851; H; H01; H01F; H01F41/00; H01F41/14; H01F41/20; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/256
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A magnetic recording medium comprising binderless thin metallic layers formed on a substrate in which tilt angle of metallic particles relative to the normal line to said substrate gradually increases in one layer and tilt angle of metallic particles relative to the normal line to said substrate in another layer gradually decreases depending upon an increase in distance from said substrate.
Claim 2
Dependent Claim
61 words
A magnetic recording medium comprising binderless thin metallic layers formed on a substrate in which tilt angle of metallic particles relative to the normal line to said substrate gradually increases in one layer and tilt angle of metallic particles relative to the normal line to said substrate in another layer gradually decreases depending upon an increase in distance from said substrate.
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) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |