US4087582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1974-11-04
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Granted: 1978-05-02
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Expires: 1994-11-04
Abstract
Abstract A magnetic recording medium comprising a support, a magnetic recording layer comprising a thin film of a ferromagnetic metal on the support, and at least one monomolecular layer comprising a saturated fatty acid or a metal salt thereof on the surface of the magnetic recording layer.
Inventors
- 👤 Ryuji Shirahata
- 👤 Tatsuji Kitamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:44
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/71; G11B5/72; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/26; Y10T428/261; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
A magnetic recording medium comprising a support, a magnetic recording layer from about .05 μm to 2 μm thick comprising a thin film of a ferromagnetic metal on said support, and one to about 100 monomolecular layers of a linear saturated fatty acid containing about 8 to 28 carbon atoms or a metal salt thereof on the outer surface of said magnetic recording layer, each of said one to about 100 monomolecular layers having a thickness of about 15 A to 30 A.
Claim 2
Dependent Claim
83 words
A magnetic recording medium comprising a support, a magnetic recording layer from about .05 μm to 2 μm thick comprising a thin film of a ferromagnetic metal on said support, and one to about 100 monomolecular layers of a linear saturated fatty acid containing about 8 to 28 carbon atoms or a metal salt thereof on the outer surface of said magnetic recording layer, each of said one to about 100 monomolecular layers having a thickness of about 15 A to 30 A.
Claim 3
Dependent Claim
29 words
The magnetic recording medium according to claim 1, wherein the metal salt is selected from the group consisting of an alkali metal salt and an alkaline earth metal salt.
Claim 4
Dependent Claim
31 words
The magnetic recording medium according to claim 1, wherein the magnetic recording layer is formed by a method selected from electroplating, electroless plating, gas-phase plating, vapor depositing, sputtering, or ion plating.
Claim 5
Dependent Claim
32 words
The magnetic recording medium according to claim 1, wherein a monomolecular layer is formed on said magnetic recording layer by transfer thereof onto the magnetic recording layer from the surface of water.
Claim 6
Dependent Claim
43 words
The magnetic recording medium according to claim 4, wherein the monomolecular layer is formed on the surface of water by dropping a volatile solvent having dissolved therein the linear fatty acid or metal salt thereof onto the water surface and evaporating the solvent.
Claim 7
Dependent Claim
53 words
The magnetic recording medium according to claim 5, wherein to facilitate transfer of the monomolecular layer from the surface of water, a surface tension of about 15 to 35 dynes/cm is applied against the monomolecular layer in a direction parallel to the plane of the monomolecular layer on the surface of the water.
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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) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |