US4390601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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: 1983-06-28
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Expires: 2000-07-02
Abstract
Abstract A magnetic recording medium comprising a non-magnetic support having thereon a vapor-deposited solid film of a ferromagnetic material formed by vacuum evaporation, on the surface of said magnetic recording medium being further provided a vapor deposited film of an organic lubricant, a macromolecular material or a mixture thereof.
Inventors
- 👤 Yoshihiro Ono
- 👤 Akira Nabara
- 👤 Tomoaki Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:10
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B5/851; G11B5/62; G11B5/72; G11B5/725; H; H01; H01F; H01F41/00; H01F41/14; H01F41/20; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31725; Y10T428/31765; Y10T428/31786; Y10T428/31801; Y10T428/31855; Y10T428/31935; Y10T428/31971
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
88 words
A magnetic recording medium comprising a non-magnetic support having thereon a vapor deposited solid film of a ferromagnetic material formed by vacuum evaporation, and on the surface of said ferromagnetic material there being further provided a vapor deposited film of an organic lubricant selected from the group consisting of a paraffin wax, a higher fatty acid, an oxyfatty acid, a fatty acid amide, a fatty acid ester, a fatty alcohol, a metal soap and a mixture thereof or a mixture of the organic lubricant and a macromolecular material.
Claim 2
Dependent Claim
88 words
A magnetic recording medium comprising a non-magnetic support having thereon a vapor deposited solid film of a ferromagnetic material formed by vacuum evaporation, and on the surface of said ferromagnetic material there being further provided a vapor deposited film of an organic lubricant selected from the group consisting of a paraffin wax, a higher fatty acid, an oxyfatty acid, a fatty acid amide, a fatty acid ester, a fatty alcohol, a metal soap and a mixture thereof or a mixture of the organic lubricant and a macromolecular material.
Claim 3
Dependent Claim
26 words
The magnetic recording medium of claim 1, wherein said vapor deposited film of the organic lubricant, or the mixture, is provided by a vacuum evaporation method.
Claim 4
Dependent Claim
47 words
The magnetic recording medium of claim 1, wherein said vapor deposited film of the organic lubricant, the macromolecular material or the mixture thereof, is provided by exposing the surface of the magnetic recording medium to the vapor of the organic lubricant, or the mixture under normal pressure.
Claim 5
Dependent Claim
31 words
The magnetic recording medium of claim 1, wherein said vapor deposited film of the mixture of the organic lubricant and the macromolecular material is provided by a simultaneous vacuum evaporation method.
Claim 6
Dependent Claim
27 words
The magnetic recording medium of claim 4, wherein the ratio of the organic lubricant to the macromolecular material in said mixture is 30% by weight or above.
Claim 7
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 8
Dependent Claim
22 words
The magnetic recording medium of claim 1, wherein said vapor deposited film of the macromolecular material is provided by vacuum evaporation method.
Claim 9
Dependent Claim
39 words
The magnetic recording medium of claim 1, wherein said macromolecular material is a polyoleffin, a vinyl resin, a vinylidene resin, a polyester, a polycarbonate, a polyamide, a polyacrylonitrile, a polyurethane, a polyether, a cellulose resin or a mixture thereof.
Claim 10
Dependent Claim
85 words
A process for preparing a magnetic recording medium which comprises vapor depositing by vacuum evaporation a solid film of a ferromagnetic material on a non-magnetic support and then vapor depositing on said ferromagnetic material a film of an organic lubricant selected from the group consisting of a paraffin wax, a higher fatty acid, an oxyfatty acid, a fatty acid amide, a fatty acid ester, a fatty alcohol, a metal soap and a mixture thereof, or a mixture of the organic lubricant and a macromolecular material.
Claim 11
Dependent Claim
85 words
A process for preparing a magnetic recording medium which comprises vapor depositing by vacuum evaporation a solid film of a ferromagnetic material on a non-magnetic support and then vapor depositing on said ferromagnetic material a film of an organic lubricant selected from the group consisting of a paraffin wax, a higher fatty acid, an oxyfatty acid, a fatty acid amide, a fatty acid ester, a fatty alcohol, a metal soap and a mixture thereof, or a mixture of the organic lubricant and a macromolecular material.
Claim 12
Dependent Claim
39 words
The process of claim 9, wherein the evaporation of the organic lubricant, or the mixture is performed by exposing the surface of the magnetic recording medium to the vapor of the organic lubricant, or the mixture under normal pressure.
Claim 13
Dependent Claim
25 words
The process of claim 9, wherein said organic lubricant is a solid having a vapor pressure of 5×10 -5 Torr or lower at room temperature.
Claim 14
Dependent Claim
28 words
The process of claim 9, wherein the evaporation of the mixture of the organic lubricant and the macromolecular material is performed by a conventional simultaneous vacuum evaporation technique.
Claim 15
Dependent Claim
25 words
The process of claim 12, wherein the ratio of the organic lubricant to the macromolecular material in said mixture is 30% by weight or above.
Claim 16
Dependent Claim
39 words
The process of claim 9, wherein the evaporation of the organic lubricant, or the mixture is performed by conventional vacuum evaporation using a resistance heater, vacuum evaporation utilizing electron beam heating, a sputtering process or an ion plating process.
Claim 17
Dependent Claim
37 words
The process of claim 9, wherein said macromolecular material is a polyoleffin, a vinyl resin, a vinylidene resin, a polyester, a polycarbonate, a polyamide, a polyacrylonitrile, a polyurethane, a polyether, a cellulose resin or a mixture thereof.
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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) | 1986-06-27 | 1986-12-27 | 1987-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-27 | 1990-12-27 | 1991-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-27 | 1994-12-27 | 1995-06-28 | $7700.00 | Window Closed / Lapsed |