US4690857A
Expired / Lapsed
US
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Magnetic recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1985-08-14
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Granted: 1987-09-01
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Expires: 2005-08-14
Abstract
Abstract A magnetic recording medium comprising a non-magnetic support having provided thereon, in sequence a thin ferromagnetic metal film, and at least one monomolecular layer comprising a saturated fatty acid salt of at least one metal selected from the group consisting of Cd, Co, Mn and Pb, or a polymer of a fatty acid or a derivative thereof.
Inventors
- 👤 Ryuji Shirahata
- 👤 Yasuo Tamai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:23
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; G11B5/726; G11B5/7262; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
102 words
A magnetic recording medium comprising a non-magnetic support having provided thereon, in sequence, a thin ferromagnetic metal film, and at least one monomolecular layer comprising a saturated fatty acid salt of at least one metal selected from the group consisting of Cd, Co, Mn and Pb, or a polymer of a fatty acid or a derivative thereof, wherein the monomolecular layer comprising a saturated fatty acid salt of the at least one metal is prepared by a Langmuir Blodgett method and wherein the monomolecular layer comprising a polymer of a fatty acid or a derivative thereof is a Langmuir Blodgett polymerized layer.
Claim 2
Dependent Claim
102 words
A magnetic recording medium comprising a non-magnetic support having provided thereon, in sequence, a thin ferromagnetic metal film, and at least one monomolecular layer comprising a saturated fatty acid salt of at least one metal selected from the group consisting of Cd, Co, Mn and Pb, or a polymer of a fatty acid or a derivative thereof, wherein the monomolecular layer comprising a saturated fatty acid salt of the at least one metal is prepared by a Langmuir Blodgett method and wherein the monomolecular layer comprising a polymer of a fatty acid or a derivative thereof is a Langmuir Blodgett polymerized layer.
Claim 3
Dependent Claim
24 words
A magnetic recording medium as claimed in claim 1, wherein either monomolecular layer has been subjected to irradiation with electron beams or electromagnetic beams.
Claim 4
Dependent Claim
18 words
A magnetic recording medium as claimed in claim 2, wherein the electromagnetic beams are γ-rays or ultraviolet rays.
Claim 5
Dependent Claim
51 words
A magnetic recording medium as claimed in claim 1, wherein the at least one monomolecular layer is said polymer of a fatty acid or derivative thereof and wherein said fatty acid or a derivative thereof is selected from the group consisting of a vinyl stearate, ω-triconsanoic acid and a diacetylene derivative.
Claim 6
Dependent Claim
35 words
A magnetic recording medium as claimed in claim 4, wherein the diacetylene derivative has the formula CH 3 (CH 2 ) n-1 C 4 (CH 2 ) 8 COOH wherein n is 8 to 15.
Claim 7
Dependent Claim
41 words
A magnetic recording medium as claimed in claim 1, wherein said at least one monomolecular layer comprising said saturated fatty acid salt of said at least one metal is one wherein the saturated fatty acid has 8 to 28 carbon atoms.
Claim 8
Dependent Claim
55 words
A magnetic recording medium as claimed in claim 1, wherein the monomolecular layer is a layer wherein monomolecules are regularly and densely arranged on the surface of the thin ferromagnetic metal film, the thickness of the layer being equivalent to the size of one molecule which is in the range of 15 to 50 Å.
Claim 9
Dependent Claim
20 words
A magnetic recording medium as claimed in claim 7, wherein the number of monomolecular layers is from 1 to 100.
Claim 10
Dependent Claim
27 words
A magnetic recording medium as claimed in claim 8, wherein the total thickness of the monomolecular layer(s) is in the range of 15 Å to 2,000 Å.
Claim 11
Dependent Claim
14 words
A magnetic recording medium as claimed in claim 1, wherein the metal is Cd.
Claim 12
Dependent Claim
14 words
A magnetic recording medium as claimed in claim 1, wherein the metal is Co.
Claim 13
Dependent Claim
14 words
A magnetic recording medium as claimed in claim 1, wherein the metal is Mn.
Claim 14
Dependent Claim
14 words
A magnetic recording medium as claimed in claim 1, wherein the metal is Pb.
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) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |