Patent US4414271A successfully refreshed from Google Patents.
US4414271A
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Magnetic recording medium and method of preparation thereof
Assignee: Fujifilm Holdings Corp
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Filing: 1982-02-25
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Granted: 1983-11-08
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Expires: 2002-02-25
Abstract
Abstract A magnetic recording medium comprising a substrate, a thin magnetic metal film having spaced-apart columnar grains deposited on the substrate, and a crosslinked organic polymer formed from a polymerizable organic compound and a curing agent in the spaces between the columnar grains and integrated therewith. The medium is prepared by impregnating the spaces between the columnar grains with a polymerizable organic compound and a curing agent and curing them in the spaces by the crosslinking reaction.
Inventors
- 👤 Tatsuji Kitamoto
- 👤 Ryuji Shirahata
- 👤 Yasuyuki Yamada
- 👤 Goro Akashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:43
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B5/851; G11B5/62; G11B5/64; G11B5/68; G11B5/70; G11B5/702; G11B5/71; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
54 words
A magnetic recording medium comprising a substrate, a thin ferromagnetic metal film having spaced-apart columnar grain structures formed on said substrate, and a crosslinked organic polymer formed from a polymerizable organic compound and a curing agent at least in the spaces between said columnar grain structures and integrated with said thin ferromagnetic metal film.
Claim 2
Dependent Claim
54 words
A magnetic recording medium comprising a substrate, a thin ferromagnetic metal film having spaced-apart columnar grain structures formed on said substrate, and a crosslinked organic polymer formed from a polymerizable organic compound and a curing agent at least in the spaces between said columnar grain structures and integrated with said thin ferromagnetic metal film.
Claim 3
Dependent Claim
23 words
A magnetic recording medium as defined in claim 1 wherein said thin ferromagnetic metal film is formed on said substrate by vapor deposition.
Claim 4
Dependent Claim
21 words
A magnetic recording medium as defined in claim 2 wherein said vapor deposition is effected by the oblique incidence deposition process.
Claim 5
Dependent Claim
25 words
A magnetic recording medium as defined in claim 1 wherein said thin ferromagnetic metal film has a thickness within the range from 0.05μ to 2μ.
Claim 6
Dependent Claim
25 words
A magnetic recording medium as defined in claim 4 wherein said thin ferromagnetic metal film has a thickness within the range from 0.1μ to 0.4μ.
Claim 7
Dependent Claim
32 words
A magnetic recording medium as defined in claim 1 wherein the volumetric ratio of the spaces between said columnar grain structures in said thin ferromagnetic metal film is from 10% to 60%.
Claim 8
Dependent Claim
27 words
A magnetic recording medium as defined in claim 1 wherein said polymerizable organic compound is a thermosetting selected from the group consisting of thermosetting and reactive resins.
Claim 9
Dependent Claim
50 words
A magnetic recording medium as defined in claim 7 wherein said thermosetting and reactive resins have a molecular weight of 200,000 or less when they are in the form of a coating solution, and exhibit an infinite increase in the molecular weight after being coated onto the substrate and dried.
Claim 10
Dependent Claim
24 words
A magnetic recording medium as defined in claim 7 wherein said thermosetting and reactive resins do not soften or melt prior to thermal decomposition.
Claim 11
Dependent Claim
17 words
A magnetic recording medium as defined in claim 1 wherein said crosslinked organic polymer contains a lubricant.
Claim 12
Independent Claim
82 words
A method of preparing a magnetic recording medium which comprises vapor-depositing a thin ferromagnetic metal film having spaced-apart columnar grain structures onto a substrate, impregnating the spaces between the columnar grain structures with at least one polymerizable organic compound and a curing agent, and curing said at least one polymerizable organic compound and said curing agent through crosslinking reaction at least in the spaces between the columnar grain structures, whereby the resulting cured product is integrated with said thin ferromagnetic metal film.
Claim 13
Independent Claim
82 words
A method of preparing a magnetic recording medium which comprises vapor-depositing a thin ferromagnetic metal film having spaced-apart columnar grain structures onto a substrate, impregnating the spaces between the columnar grain structures with at least one polymerizable organic compound and a curing agent, and curing said at least one polymerizable organic compound and said curing agent through crosslinking reaction at least in the spaces between the columnar grain structures, whereby the resulting cured product is integrated with said thin ferromagnetic metal film.
Claim 14
Dependent Claim
25 words
A method of preparing a magnetic recording medium as defined in claim 11 wherein said vapor deposition is effected by the oblique incidence deposition process.
Claim 15
Dependent Claim
29 words
A method of preparing a magnetic recording medium as defined in claim 12 wherein the incident angle of the vapor stream of the ferromagnetic metal is 50° or more.
Claim 16
Dependent Claim
29 words
A method of preparing a magnetic recording medium as defined in claim 11 wherein said thin ferromagnetic metal film has a thickness within the range from 0.05μ to 2μ.
Claim 17
Dependent Claim
29 words
A method of preparing a magnetic recording medium as defined in claim 14 wherein said thin ferromagnetic metal film has a thickness within the range from 0.1μ to 0.4μ.
Claim 18
Dependent Claim
36 words
A method of preparing a magnetic recording medium as defined in claim 11 wherein the volumetric ratio of the spaces between said columnar grain structures in said thin ferromagnetic metal film is from 10% to 60%.
Claim 19
Dependent Claim
40 words
A method of preparing a magnetic recording medium as defined in claim 11 wherein an ultrasonic wave is directed onto said thin ferromagnetic metal film during the application of said at least one polymerizable organic compound and said curing agent.
Claim 20
Dependent Claim
32 words
A method of preparing a magnetic recording medium as defined in claim 11 wherein said at least one polymerizable organic compound is selected from the group consisting of thermosetting and reactive resins.
Claim 21
Dependent Claim
54 words
A method of preparing a magnetic recording medium as defined in claim 18 wherein said thermosetting and reactive resins have a molecular weight of 200,000 or less when they are in the form of a coating solution, and exhibit an infinite increase in the molecular weight after being coated onto the substrate and dried.
Claim 22
Dependent Claim
28 words
A method of preparing a magnetic recording medium as defined in claim 18 wherein said thermosetting and reactive resins do not soften or melt prior to thermal decomposition.
Claim 23
Dependent Claim
20 words
A method of preparing a magnetic recording medium as defined in claim 11 wherein said cured product contains a lubricant.
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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) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |