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US4418126A
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Magnetic recording medium
Assignee: TDK Corp
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Filing: 1981-07-15
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Granted: 1983-11-29
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Expires: 2001-07-15
Abstract
Abstract A magnetic recording medium comprises a thin metallic magnetic layer on a non-magnetic substrate wherein said thin metallic magnetic layer is made of cobalt, nickel and chromium.
Inventors
- 👤 Toshiaki Izumi
- 👤 Yasuta Taketomi
- 👤 Takayoshi Kobuke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:27
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/65; G11B5/656; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
59 words
A magnetic recording medium which comprises a thin metallic magnetic layer on a non-magnetic substrate wherein said thin metallic magnetic layer is made of cobalt, nickel and chromium having a ratio of cobalt to nickel in a range of 9:1 to 7:3 and chromium content of up to 5 atomic percent based on the total of cobalt and nickel.
Claim 2
Dependent Claim
59 words
A magnetic recording medium which comprises a thin metallic magnetic layer on a non-magnetic substrate wherein said thin metallic magnetic layer is made of cobalt, nickel and chromium having a ratio of cobalt to nickel in a range of 9:1 to 7:3 and chromium content of up to 5 atomic percent based on the total of cobalt and nickel.
Claim 3
Dependent Claim
31 words
The magnetic recording medium according to claim 1 wherein a content of chromium is in a range of 0.5 to 5 atomic percent based on the total of cobalt and nickel.
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) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |