US4548864A
Expired / Lapsed
US
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Magnetic recording medium having an organic metal underlayer
Assignee: TDK Corp
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Filing: 1983-09-06
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Granted: 1985-10-22
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Expires: 2003-09-06
Abstract
Abstract A magnetic recording medium comprises a base, a thin ferromagnetic metal film, and a plasma-polymerized organic material layer sandwiched between them. The plasma-polymer is made of an organic metal and the layer is not less than 10 Å thick. The ferromagnetic metal film is composed mainly of a cobalt-nickel alloy and formed by vacuum deposition.
Inventors
- 👤 Masatoshi Nakayama
- 👤 Toshiaki Izumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:24
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/733; G11B5/7334; G11B5/739; G11B5/73923; G11B5/73927; G11B5/73929; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A magnetic recording medium comprising a base, a plasma-polymerized organic metal polymer layer formed on said base, the metal of said organic polymer being selected from the group consisting of Sn, Ti, Al, Co, Fe, Cu, Ni, Mn, Zn, Pb, In, Hg, Mg, Au, Ag, and Cd, said plasma-polymerized layer having a thickness of 10 to 100 angstroms, and a thin ferro-magnetic metallic film formed on said plasma-polymerized layer.
Claim 2
Dependent Claim
69 words
A magnetic recording medium comprising a base, a plasma-polymerized organic metal polymer layer formed on said base, the metal of said organic polymer being selected from the group consisting of Sn, Ti, Al, Co, Fe, Cu, Ni, Mn, Zn, Pb, In, Hg, Mg, Au, Ag, and Cd, said plasma-polymerized layer having a thickness of 10 to 100 angstroms, and a thin ferro-magnetic metallic film formed on said plasma-polymerized layer.
References Cited (Backward Citations)
US4307156A
Cited
US4429024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |