Patent US4336310A successfully refreshed from Google Patents.
US4336310A
Expired / Lapsed
US
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Magnetic recording medium and preparation thereof
Assignee: TDK Corp
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Filing: 1980-11-19
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Granted: 1982-06-22
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Expires: 2000-11-19
Abstract
Abstract A magnetic recording medium comprises a substrate coated with a magnetic layer comprising a binder resin and a metallic magnetic powder supporting silica on the surface which is coated with sequential layers of hydrolyzed silane compound and oleic acid. A magnetic recording medium is produced by sequentially treating a metallic magnetic powder supporting silica on the surface with a solution of a hydrolyzable silane compound and a solution of oleic acid to obtain a magnetic powder having the coated sequential layers and admixing the coated magnetic powder with a binder resin to prepare a magnetic composition and coating the magnetic composition on a substrate to form a magnetic layer.
Inventors
- 👤 Kiyotaka Okuyama
- 👤 Akihiko Hosaka
- 👤 Yukihiro Isobe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:33
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/708; G11B5/7085; G11B5/712; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06; H01F1/061; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
50 words
A magnetic recording medium which comprises a substrate coated with a magnetic layer comprising a binder resin and a metallic magnetic powder supporting silica on its surface which is coated with sequential layers of hydrolyzed silane compound and oleic acid, wherein said hydrolyzed silane compound is bonded to said silica.
Claim 2
Dependent Claim
50 words
A magnetic recording medium which comprises a substrate coated with a magnetic layer comprising a binder resin and a metallic magnetic powder supporting silica on its surface which is coated with sequential layers of hydrolyzed silane compound and oleic acid, wherein said hydrolyzed silane compound is bonded to said silica.
Claim 3
Dependent Claim
39 words
The magnetic recording medium according to claim 1 wherein said hydrolyzed silane compound is formed by hydrolysis of a silane compound having the formula R'Si(OR) 3 wherein R represents a lower alkyl group and R' represents an organic moiety.
Claim 4
Dependent Claim
72 words
A process for preparing a magnetic recording medium which comprises sequentially treating a metallic magnetic powder supporting silica on its surface with a solution of a hydrolyzable silane compound and a solution of oleic acid to obtain a magnetic powder having sequential coated layers, and admixing the coated magnetic powder with a binder resin to prepare a magnetic composition and coating the magnetic composition on a substrate to form a magnetic layer.
Claim 5
Dependent Claim
72 words
A process for preparing a magnetic recording medium which comprises sequentially treating a metallic magnetic powder supporting silica on its surface with a solution of a hydrolyzable silane compound and a solution of oleic acid to obtain a magnetic powder having sequential coated layers, and admixing the coated magnetic powder with a binder resin to prepare a magnetic composition and coating the magnetic composition on a substrate to form a magnetic layer.
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) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |