US4476195A
Expired / Lapsed
US
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Magnetic recording medium and process for the production thereof
Assignee: Fujifilm Holdings Corp
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Filing: 1980-07-02
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Granted: 1984-10-09
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Expires: 2000-07-02
Abstract
Abstract A magnetic recording medium having, on a non-magnetic support, a magnetic recording layer of a mixture of a ferromagnetic material and an organic lubricant, which magnetic recording layer is prepared by the simultaneous vacuum evaporation process to result in improvements upon the surface strength and slip characteristics.
Inventors
- 👤 Yoshihiro Ono
- 👤 Akira Nabara
- 👤 Tomoaki Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:06
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/71; C; C23; C23C; C23C14/00; C23C14/06; G11B5/84; G11B5/85; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
71 words
A magnetic recording medium comprising a non-magnetic support having thereon a magnetic recording layer comprising a layer of a simultaneously evaporated mixture consisting essentially of a ferromagnetic material and an organic lubricant, said organic lubricant being selected from the group consisting of a paraffin wax, a higher fatty acid, an oxy fatty acid, a fatty acid amide, a fatty acid ester, a fatty alcohol, a metal soap and a mixture thereof.
Claim 2
Dependent Claim
71 words
A magnetic recording medium comprising a non-magnetic support having thereon a magnetic recording layer comprising a layer of a simultaneously evaporated mixture consisting essentially of a ferromagnetic material and an organic lubricant, said organic lubricant being selected from the group consisting of a paraffin wax, a higher fatty acid, an oxy fatty acid, a fatty acid amide, a fatty acid ester, a fatty alcohol, a metal soap and a mixture thereof.
Claim 3
Dependent Claim
27 words
The magnetic recording medium of claim 1, wherein said organic lubricant is a solid having a vapor pressure of 5×10 -5 Torr or lower at room temperature.
Claim 4
Dependent Claim
23 words
The magnetic recording medium of claim 1, wherein the volume ratio of the organic lubricant to the ferromagnetic material is 3.0:1 or less.
Claim 5
Dependent Claim
98 words
A process for producing a magnetic recording medium, comprising a non-magnetic support having thereon a magnetic recording layer comprising a layer of a simultaneously evaporated mixture consisting essentially of a ferromagnetic material and an organic lubricant, said organic lubricant being selected from the group consisting of a paraffin wax, a higher fatty acid, an oxy fatty acid, a fatty acid amide, a fatty acid ester, a fatty alcohol, a metal soap and a mixture thereof, which comprises simultaneously evaporating both said ferromagnetic material and said organic lubricant onto a non-magnetic support to form a magnetic recording layer thereon.
Claim 6
Dependent Claim
98 words
A process for producing a magnetic recording medium, comprising a non-magnetic support having thereon a magnetic recording layer comprising a layer of a simultaneously evaporated mixture consisting essentially of a ferromagnetic material and an organic lubricant, said organic lubricant being selected from the group consisting of a paraffin wax, a higher fatty acid, an oxy fatty acid, a fatty acid amide, a fatty acid ester, a fatty alcohol, a metal soap and a mixture thereof, which comprises simultaneously evaporating both said ferromagnetic material and said organic lubricant onto a non-magnetic support to form a magnetic recording layer thereon.
Claim 7
Dependent Claim
25 words
The process of claim 4, wherein said organic lubricant is a solid having a vapor pressure of 5×10 -5 Torr or lower at room temperature.
Claim 8
Dependent Claim
21 words
The process of claim 4, wherein the volume ratio of the organic lubricant to the ferromagnetic material is 3.0:1 or less.
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) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |