US4414289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High density magnetic recording medium
Assignee: TDK Corp
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Filing: 1982-03-18
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Granted: 1983-11-08
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Expires: 2002-03-18
Abstract
Abstract A magnetic recording medium comprised of a nonmagnetic base and a magnetic coating layer thereon, said magnetic coating layer comprises ferromagnetic particles dispersed in a binder vehicle, characterized in that said magnetic coating layer contains a glyceride and a sorbitan ester of fatty acid.
Inventors
- 👤 Fujio Shibata
- 👤 Kenji Hirabayashi
- 👤 Chihoto Mikura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:34
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/7013; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
53 words
A magnetic recording medium carrying means for recording magnetic information comprised of a nonmagnetic base and a magnetic coating layer fixed on said base, said magnetic coating layer comprises ferromagnetic particles dispersed in a binder vehicle, characterized in that said magnetic coating layer contains a glyceride and a sorbitan ester of fatty acid.
Claim 2
Dependent Claim
53 words
A magnetic recording medium carrying means for recording magnetic information comprised of a nonmagnetic base and a magnetic coating layer fixed on said base, said magnetic coating layer comprises ferromagnetic particles dispersed in a binder vehicle, characterized in that said magnetic coating layer contains a glyceride and a sorbitan ester of fatty acid.
Claim 3
Dependent Claim
37 words
A magnetic recording medium according to claim 1, wherein said glyceride and a sorbitan ester are contained in a combined amount of 1 to 5% by weight on the basis of the weight of the ferromagnetic particles.
Claim 4
Dependent Claim
32 words
A magnetic recording medium according to claim 1 or 2, wherein said fatty acid forming said sorbitan ester is selected from the group consisting of stearic acid, oleic acid and palmitic acid.
Claim 5
Dependent Claim
29 words
A magnetic recording medium according to claim 1 or 2, wherein said glyceride is selected from the group consisting of glycerides of stearic acid, oleic acid and palmitic acid.
Claim 6
Dependent Claim
25 words
A magnetic recording medium according to claim 1 or 2, wherein said ferromagnetic particles are acicular magnetic particles of an alloy composed chiefly of iron.
References Cited (Backward Citations)
US3029157A
Cited
US3387993A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |