US4711809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1984-09-25
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Granted: 1987-12-08
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Expires: 2004-09-25
Abstract
Abstract A magnetic recording medium is disclosed which comprises a support having provided thereon a thin magnetic metal film, a plasma polymerized layer being provided on the thin magnetic film, in which the plasma polymerized layer is formed in a monomer gas or in a gas containing the monomer gas of at least one of compounds represented by the following general formulae (I) or (II), ##STR1## wherein A represents a hydrogen atom or a fluorine atom, B represents a hydrogen atom, a chlorine atom or an alkyl group having 1 to 4 carbon atoms, an alkenyl group having 2 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an alkanoyloxy group having 1 to 4 carbon atoms, which is unsubstituted or substituted with a fluorine atom, D represents a hydrogen atom, --R, --O--R, ##STR2## where R represents an alkyl group having 1 to 4 carbon atoms or an alkenyl group having 2 to 4 carbon atoms.
Inventors
- 👤 Yasuo Nishikawa
- 👤 Tsutomu Okita
- 👤 Yoshito Mukaida
- 👤 Masahiro Niinomi
- 👤 Kenji Yanagihara
- 👤 Mituo Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:49
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
113 words
A magnetic recording medium comprising a support having provided thereon a thin magnetic metal film, and a plasma polymerized layer provided on the thin magnetic film, wherein said plasma polymerized layer is formed in a monomer gas or in a gas containing the monomer gas, wherein the monomer gas or in a gas containing the monomer gas, wherein the monomer gas is at least one of 1,1-difluoroethylene, trifluoroethylene, 1,1-difluorochloroethylene, and hexafluorobutadiene, wherein said plasma polymerized layer is formed at a pressure of 10 -3 Torr to 1 Torr, wherein the thickness of the plasma polymerized layer is from 2 nm to 100 nm, and wherein the plasma polymerized layer is homogeneous in nature.
Claim 2
Dependent Claim
113 words
A magnetic recording medium comprising a support having provided thereon a thin magnetic metal film, and a plasma polymerized layer provided on the thin magnetic film, wherein said plasma polymerized layer is formed in a monomer gas or in a gas containing the monomer gas, wherein the monomer gas or in a gas containing the monomer gas, wherein the monomer gas is at least one of 1,1-difluoroethylene, trifluoroethylene, 1,1-difluorochloroethylene, and hexafluorobutadiene, wherein said plasma polymerized layer is formed at a pressure of 10 -3 Torr to 1 Torr, wherein the thickness of the plasma polymerized layer is from 2 nm to 100 nm, and wherein the plasma polymerized layer is homogeneous in nature.
Claim 3
Dependent Claim
98 words
A magnetic recording medium comprising a support having provided thereon a thin magnetic metal film, and a plasma polymerized layer provided on the thin magnetic film, wherein said plasma polymerized layer is formed in a monomer gas or in a gas containing the monomer gas, wherein the monomer gas is trifluoroethylene, 1,1-difluoroethylene, or a mixture thereof, wherein said plasma polymerized layer is formed at a pressure of 10 -3 Torr to 1 Torr, wherein the thickness of the plasma polymerized layer is from 2 nm to 100 nm, and wherein the plasma polymerized layer is homogenous in nature.
Claim 4
Dependent Claim
98 words
A magnetic recording medium comprising a support having provided thereon a thin magnetic metal film, and a plasma polymerized layer provided on the thin magnetic film, wherein said plasma polymerized layer is formed in a monomer gas or in a gas containing the monomer gas, wherein the monomer gas is trifluoroethylene, 1,1-difluoroethylene, or a mixture thereof, wherein said plasma polymerized layer is formed at a pressure of 10 -3 Torr to 1 Torr, wherein the thickness of the plasma polymerized layer is from 2 nm to 100 nm, and wherein the plasma polymerized layer is homogenous in nature.
Claim 5
Dependent Claim
23 words
A magnetic recording medium as in claim 2, wherein the thickness of the plasma polymerized layer is from 2 nm to 40 nm.
Claim 6
Independent Claim
99 words
A method of forming a plasma polymerized layer on a thin magnetic metal film provided on a support forming a magnetic recording medium, comprising subjecting the thin magnetic film to plasma generated between two electrodes in a vacuum chamber containing a monomer gas or a gas containing the monomer gas, the monomer gas being at least one of 1,1-difluoroethylene, trifluoroethylene, 1,1-difluorochloroethylene and hexafluorobutadiene, wherein said vacuum chamber is maintained at from 10 -3 Torr, wherein the thickness of the plasma polymerized layer is from 2 nm to 100 nm, and wherein the plasma polymerized layer is homogeneous in nature.
Claim 7
Independent Claim
99 words
A method of forming a plasma polymerized layer on a thin magnetic metal film provided on a support forming a magnetic recording medium, comprising subjecting the thin magnetic film to plasma generated between two electrodes in a vacuum chamber containing a monomer gas or a gas containing the monomer gas, the monomer gas being at least one of 1,1-difluoroethylene, trifluoroethylene, 1,1-difluorochloroethylene and hexafluorobutadiene, wherein said vacuum chamber is maintained at from 10 -3 Torr, wherein the thickness of the plasma polymerized layer is from 2 nm to 100 nm, and wherein the plasma polymerized layer is homogeneous in nature.
Claim 8
Independent Claim
103 words
A method of forming a plasma polymerized layer on a thin magnetic metal film provided on a support forming a magnetic recording medium, comprising subjecting the thin magnetic film to plasma generated between two electrodes in a vacuum chamber containing a monomer gas or a gas containing the monomer gas, the monomer gas being at least one of trifluoroethylene, 1,1-difluoroethylene, or a mixture thereof, wherein said vacuum chamber is maintained at from 10 -3 Torr to 1 Torr, wherein the thickness of the plasma polymerized layer is from 2 nm to 100 nm, and wherein the plasma polymerized layer is homogeneous in nature.
Claim 9
Independent Claim
103 words
A method of forming a plasma polymerized layer on a thin magnetic metal film provided on a support forming a magnetic recording medium, comprising subjecting the thin magnetic film to plasma generated between two electrodes in a vacuum chamber containing a monomer gas or a gas containing the monomer gas, the monomer gas being at least one of trifluoroethylene, 1,1-difluoroethylene, or a mixture thereof, wherein said vacuum chamber is maintained at from 10 -3 Torr to 1 Torr, wherein the thickness of the plasma polymerized layer is from 2 nm to 100 nm, and wherein the plasma polymerized layer is homogeneous in nature.
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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) | 1990-12-07 | 1991-06-08 | 1991-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-07 | 1995-06-08 | 1995-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-07 | 1999-06-08 | 1999-12-08 | $7700.00 | Window Closed / Lapsed |