US4587179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium and manufacturing process thereof
Assignee: Ulvac Inc
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Filing: 1983-11-07
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Granted: 1986-05-06
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Expires: 2003-11-07
Abstract
Abstract A magnetic recording member characterized in that a magnetic film formed on a surface of a substrate has a very small amount of hydrogen mixed therein. The manufacturing process therefor is characterized in that hydrogen gas is introduced into the vacuum treatment chamber while the magnetic particles are adhered to the surface of the substrate.
Inventors
- 👤 Kyuzo Nakamura
- 👤 Yoshifumi Ota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:53
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/14; H01F41/20; G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/84; G11B5/85; G11B5/851; H01F10/00; H01F10/08; H01F10/10; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
36 words
A magnetic recording member characterized in that a magnetic film formed on a surface of a substrate has a very small amount of hydrogen mixed therein, the mixing amount of hydrogen atom being about 0.2-7 at.%.
Claim 2
Dependent Claim
36 words
A magnetic recording member characterized in that a magnetic film formed on a surface of a substrate has a very small amount of hydrogen mixed therein, the mixing amount of hydrogen atom being about 0.2-7 at.%.
Claim 3
Dependent Claim
90 words
A manufacturing process of a magnetic recording member characterized in that, when magnetic particles are to be adhered to a surface of a substrate in order to form a magnetic film thereof in a vacuum treatment chamber, hydrogen gas having a partial pressure within a range of 1×10 -4 to 10 -2 Torr is introduced into the treatment chamber and the adhesion of the magnetic particles is carried out in a hydrogen gas atmosphere, so that there is formed a magnetic film thereof having 0.2-7 at.% of hydrogen mixed therein.
Claim 4
Dependent Claim
90 words
A manufacturing process of a magnetic recording member characterized in that, when magnetic particles are to be adhered to a surface of a substrate in order to form a magnetic film thereof in a vacuum treatment chamber, hydrogen gas having a partial pressure within a range of 1×10 -4 to 10 -2 Torr is introduced into the treatment chamber and the adhesion of the magnetic particles is carried out in a hydrogen gas atmosphere, so that there is formed a magnetic film thereof having 0.2-7 at.% of hydrogen mixed therein.
Claim 5
Dependent Claim
46 words
The manufacturing process of claim 2, wherein the introduction of the hydrogen gas is carried out by arranging a hydrogen gas introducing pipe to be open near a surface portion of the substrate that is to be subjected to the vapor deposition of magnetic vapor particles.
Claim 6
Dependent Claim
19 words
The manufacturing process of claim 2 wherein the temperature of the substrate is from room temperature to 60° C.
Claim 7
Dependent Claim
15 words
The manufacturing process of claim 3, wherein the vapor deposition is an oblique incident one.
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) | 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 |