US4315057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium
Assignee: TDK Corp
•
Filing: 1980-10-01
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Granted: 1982-02-09
•
Expires: 2000-10-01
Abstract
Abstract A magnetic recording medium comprises a substrate coated with a magnetic layer comprising a magnetic powder and a binder and a rust inhibitor at a ratio of more than 0.1 wt. % based on resins of the binder.
Inventors
- 👤 Eiji Horigome
- 👤 Hitoshi Azegami
- 👤 Hiroshi Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:53
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7028; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
50 words
In a magnetic recording medium which comprises a substrate coated with a magnetic layer comprising a magnetic powder, a resinous binder and a rust inhibitor, the improvement of the rust inhibitor comprising benzotriazole or benzodiazole at a ratio of more than 0.1 wt. % based on resins of the binder.
Claim 2
Dependent Claim
50 words
In a magnetic recording medium which comprises a substrate coated with a magnetic layer comprising a magnetic powder, a resinous binder and a rust inhibitor, the improvement of the rust inhibitor comprising benzotriazole or benzodiazole at a ratio of more than 0.1 wt. % based on resins of the binder.
Claim 3
Dependent Claim
14 words
The magnetic recording medium according to claim 1 wherein said rust inhibitor is benzotriazole.
Claim 4
Dependent Claim
14 words
The magnetic recording medium according to claim 1 wherein said rust inhibitor is benzodiazole.
References Cited (Backward Citations)
US3922389A
Cited
US4074012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-08 | 1985-08-10 | 1986-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-08 | 1989-08-10 | 1990-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-08 | 1993-08-10 | 1994-02-09 | $7700.00 | Window Closed / Lapsed |