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Patent US4401725A successfully refreshed from Google Patents.
US4401725A
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US
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Magnetic recording medium
Assignee: Sony Corp
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Filing: 1982-09-07
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Granted: 1983-08-30
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Expires: 2002-09-07
Abstract
Abstract A magnetic recording medium consisting of a non-magnetic substrate and a thin film metal magnetic layer is disclosed. The magnetic recording medium carries polyphenyl ether compound having the following formula <IMAGE> where n is an integer satisfying the following condition; 2</=n</=10.
Inventors
- 👤 Kazunori Ozawa
- 👤 Takahiro Kawana
- 👤 Nakaharu Seki
- 👤 Naoya Komada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:10
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; G11B5/725; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
39 words
A magnetic recording medium comprising a non-magnetic substrate and thin film metal magnetic layer formed thereon, said magnetic recording medium carrying polyphenyl ether compound having following formula ##STR4## wherein n is an integer satisfying the following condition: ≦ n≦10.
Claim 2
Dependent Claim
39 words
A magnetic recording medium comprising a non-magnetic substrate and thin film metal magnetic layer formed thereon, said magnetic recording medium carrying polyphenyl ether compound having following formula ##STR4## wherein n is an integer satisfying the following condition: ≦ n≦10.
Claim 3
Dependent Claim
20 words
A magnetic recording medium as claimed in claim 1, wherein said polyphenyl ether compound is formed on said magnetic layer.
Claim 4
Dependent Claim
29 words
A magnetic recording medium as claimed in claim 2, wherein said polyphenyl ether is coated on said magnetic layer with an amount between 1 and 100 mg/m 2 .
Claim 5
Dependent Claim
29 words
A magnetic recording medium as claimed in claim 2, wherein said polyphenyl ether is coated on said magnetic layer with an amount between 2 and 20 mg/m 2 .
Claim 6
Dependent Claim
21 words
A magnetic recording medium as claimed in claim 1, wherein said magnetic layer is magnetic metal formed by physical vapour deposition.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |