US4587157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wear resisting undercoat for thin film magnetic recording media
Assignee: Verbatim Corp
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Filing: 1982-10-25
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Granted: 1986-05-06
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Expires: 2002-10-25
Abstract
Abstract A flexible magnetic recording media, such as disks or magnetic tape, having a non-magnetic layer intermediate the substrate and magnetic recording layers providing improved durability of the magnetic recording layer including a binder comprised of non-magnetic particles of αFe 2 O 3 with similar physical properties as those of the magnetic recording layer (γFe 2 O 3 or Co-γFe 2 O 3 ) and a reservoir of lubricant.
Inventors
- 👤 George W. Brock
- 👤 George J. Hampton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:34
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; G11B5/725; G11B5/73; G11B5/733; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/24; Y10T428/2419; Y10T428/24215; Y10T428/24231; Y10T428/2424; Y10T428/24248; Y10T428/24273; Y10T428/24281; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
176 words
A flexible magnetic recording media comprising: a base film substrate layer; a magnetic recording layer comprising a plurality of particles of a magnetic oxide coated over the base film substrate layer for magnetically communicating with external sensing devices; and an intermediate layer comprising a plurality of particles of a non-magnetic oxide situated intermediate the base film substrate layer and the magnetic recording layer, said plurality of particles of non-magnetic oxide being of similar size, dispersion and weight concentration and possessing similar physical properties to those of said plurality of particles of magnetic oxide in the magnetic recording layer, the intermediate layer being a porous reservoir of lubricant for providing increased lubrication potential to the magnetic recording layer, the intermediate layer being in physical communication with the magnetic recording layer forming a composite layer, said composite layer being overcoated with a lubricant and in mechanical communication with the base film substrate layer, and said composite layer providing an added dimension of hardness to the magnetic recording layer and a reservoir of lubrication for the magnetic recording layer.
Claim 2
Dependent Claim
176 words
A flexible magnetic recording media comprising: a base film substrate layer; a magnetic recording layer comprising a plurality of particles of a magnetic oxide coated over the base film substrate layer for magnetically communicating with external sensing devices; and an intermediate layer comprising a plurality of particles of a non-magnetic oxide situated intermediate the base film substrate layer and the magnetic recording layer, said plurality of particles of non-magnetic oxide being of similar size, dispersion and weight concentration and possessing similar physical properties to those of said plurality of particles of magnetic oxide in the magnetic recording layer, the intermediate layer being a porous reservoir of lubricant for providing increased lubrication potential to the magnetic recording layer, the intermediate layer being in physical communication with the magnetic recording layer forming a composite layer, said composite layer being overcoated with a lubricant and in mechanical communication with the base film substrate layer, and said composite layer providing an added dimension of hardness to the magnetic recording layer and a reservoir of lubrication for the magnetic recording layer.
Claim 3
Dependent Claim
52 words
The flexible magnetic recording media of claim 1 wherein, the intermediate layer positioned intermediate the magnetic recording layer and the base film substrate layer acts to diminish surface irregularity effects of the base film substrate layer, for providing avoidance of compliance errors between the magnetic recording layer and said external sensing devices.
Claim 4
Dependent Claim
36 words
The flexible magnetic recording media of claim 1 wherein, said non-magnetic particles and said reservoir of lubrication are incorporated within a binder to form the intermediate layer for providing greater durability of the magnetic recording layer.
Claim 5
Dependent Claim
25 words
The flexible magnetic recording media of claim 1 wherein, the intermediate layer is approximately five micrometers in thickness and comprises αFe 2 O 3 .
Claim 6
Dependent Claim
40 words
The flexible magnetic recording media of claim 1 wherein, the magnetic recording layer is approximately one micrometer in thickness and is a particle layer selected from the group consisting of γFe 2 O 3 and Co-γFe 2 O 3 .
Claim 7
Dependent Claim
33 words
The flexible magnetic recording media of claim 1 wherein, the lubricant that overcoats the composite layer is a material selected from the group consisting of esters, hydrocarbon oils fluorocarbons, fatty acids, and silicones.
Claim 8
Dependent Claim
32 words
The flexible magnetic recording media of claim 1 wherein; the surface of the intermediate layer is burnished for removing the irregularities on the surface prior to application of the magnetic recording layer.
Claim 9
Dependent Claim
185 words
A flexible magnetic recording media comprising: a base film substrate layer; a magnetic recording layer comprising a plurality of particles of a magnetic oxide and a lubricant coated over the base film substrate layer for magnetically communicating with external sensing devices; and an intermediate layer comprising a plurality of particles of a non-magnetic oxide and a lubricant situated intermediate the base film substrate layer and the magnetic recording layer, said particles of non-magnetic oxide being of similar size, dispersion, and weight concentration and possessing similar physical properties to those of said plurality of particles of magnetic oxide in the magnetic recording layer, the intermediate layer being a porous reservoir of lubricant for providing increased lubrication potential to the magnetic recording layer, the lubricant containing intermediate layer being in physical communication with the lubricant containing magnetic recording layer, and the intermediate layer and the recording layer together forming a composite layer, said composite layer being in mechanical communication with the base film substrate layer and providing an added dimension of hardness to the magnetic recording layer and a reservoir of lubrication for the magnetic recording layer.
Claim 10
Dependent Claim
185 words
A flexible magnetic recording media comprising: a base film substrate layer; a magnetic recording layer comprising a plurality of particles of a magnetic oxide and a lubricant coated over the base film substrate layer for magnetically communicating with external sensing devices; and an intermediate layer comprising a plurality of particles of a non-magnetic oxide and a lubricant situated intermediate the base film substrate layer and the magnetic recording layer, said particles of non-magnetic oxide being of similar size, dispersion, and weight concentration and possessing similar physical properties to those of said plurality of particles of magnetic oxide in the magnetic recording layer, the intermediate layer being a porous reservoir of lubricant for providing increased lubrication potential to the magnetic recording layer, the lubricant containing intermediate layer being in physical communication with the lubricant containing magnetic recording layer, and the intermediate layer and the recording layer together forming a composite layer, said composite layer being in mechanical communication with the base film substrate layer and providing an added dimension of hardness to the magnetic recording layer and a reservoir of lubrication for the magnetic recording layer.
Claim 11
Dependent Claim
52 words
The flexible magnetic recording media of claim 8 wherein, the intermediate layer positioned intermediate the magnetic recording layer and the base film substrate layer acts to diminish surface irregularity effects of the base film substrate layer for providing avoidance of compliance errors between the magnetic recording layer and said external sensing devices.
Claim 12
Dependent Claim
36 words
The flexible magnetic recording media of claim 8 wherein, said non-magnetic particles and said reservoir of lubrication are incorporated within a binder to form the intermediate layer for providing greater durability of the magnetic recording layer.
Claim 13
Dependent Claim
27 words
The flexible magnetic recording media of claim 8 wherein, the intermediate layer is of a thickness of approximately one-to-ten micrometers and comprises αFe 2 O 3 .
Claim 14
Dependent Claim
44 words
The flexible magnetic recording media of claim 8 wherein, the magnetic recording layer is of a thickness of approximately one-half to two micrometers and is a particle layer selected from the group consisting of γFe 2 O 3 and Co-γFe 2 O 3 .
Claim 15
Dependent Claim
33 words
The flexible magnetic recording media of claim 8 wherein, the lubricant resident in the composite layers is a material selected from the group consisting of esters, hydrocarbon oils, fluorocarbons, fatty acids, and silicones.
Claim 16
Dependent Claim
32 words
The flexible magnetic recording media of claim 8 wherein, the surface of the intermediate layer is burnished for removing the irregularities on the surface prior to application of the magnetic recording layer.
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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) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |