US4581245A
Expired / Lapsed
US
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Method of manufacturing of abrasion resisting magnetic recording product
Assignee: Ulvac Inc
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Filing: 1982-12-21
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Granted: 1986-04-08
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Expires: 2002-12-21
Abstract
Abstract A method and apparatus for making an abrasion-resistant magnetic recording product comprising forming a magnetic film on the surface of a substrate in a vacuum container, and thereafter, vapor depositing a lubricant on the surface of the magnetic film in the same vacuum container. Preferably, the surface of the magnetic film can be oxidized with an oxidizing gas by ion bombardment in the same vacuum container, prior to vapor depositing the lubricant.
Inventors
- 👤 Kyuzo Nakamura
- 👤 Yoshifumi Ota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:24
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/56; C23C14/562; G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; G11B5/725; G11B5/84
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
72 words
A method of manufacturing an abrasion resistant magnetic recording product comprising the steps of: (1) forming a metallic magnetic film on a surface of a substrate; (2) oxidizing the surface of the magnetic film with an oxidizing gas by ion bombardment; and (3) vapor depositing a lubricant on a surface of the oxidized magnetic film, wherein steps (1), (2) and (3) are performed successively under a vacuum in the same vacuum container.
Claim 2
Independent Claim
72 words
A method of manufacturing an abrasion resistant magnetic recording product comprising the steps of: (1) forming a metallic magnetic film on a surface of a substrate; (2) oxidizing the surface of the magnetic film with an oxidizing gas by ion bombardment; and (3) vapor depositing a lubricant on a surface of the oxidized magnetic film, wherein steps (1), (2) and (3) are performed successively under a vacuum in the same vacuum container.
Claim 3
Dependent Claim
35 words
A method of manufacturing an abrasion resistant magnetic recording product as claimed in claim 1, wherein the lubricant is selected from a group consisting of higher fatty acids and metallic salts, amides or esters thereof.
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) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |