US4532178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording media comprising a magnetic layer on one side of a support and a non-magnetic tio layer on the other side
Assignee: Victor Company of Japan Ltd
•
Filing: 1983-07-27
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Granted: 1985-07-30
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Expires: 2003-07-27
Abstract
Abstract Magnetic recording media which comprise a support, a magnetic recording layer on one side of the support, and a non-magnetic layer comprising TiO on the other side are described. The non-magnetic layer is made of a dispersion of TiO particles in a resin binder or is a continuous vacuum-deposited TiO layer.
Inventors
- 👤 Yukio Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:54
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/739; G11B5/7305; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/256
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
37 words
A magnetic recording medium which comprises a support, a magnetic recording layer formed on one side of said support, and a non-magnetic layer formed on the other side of said support, wherein said non-magnetic layer comprises TiO.
Claim 2
Dependent Claim
37 words
A magnetic recording medium which comprises a support, a magnetic recording layer formed on one side of said support, and a non-magnetic layer formed on the other side of said support, wherein said non-magnetic layer comprises TiO.
Claim 3
Dependent Claim
34 words
A magnetic recording medium according to claim 1, wherein said non-magnetic layer is made of a dispersion of TiO particles having an average size ranging from 0.01 to 5 microns in a resin binder.
Claim 4
Dependent Claim
30 words
A magnetic recording medium according to claim 2, wherein said dispersion comprises 20 to 90 wt% of said TiO particles and correspondingly 80 to 10 wt% of said resin binder.
Claim 5
Dependent Claim
24 words
A magnetic recording medium according to claim 2, wherein said TiO particles have an average size smaller than a thickness of said non-magnetic layer.
Claim 6
Dependent Claim
23 words
A magnetic recording medium according to claim 2, further comprising up to 70 wt% of carbon black based on the TiO particles used.
Claim 7
Dependent Claim
18 words
A magnetic recording medium according to claim 1, wherein said non-magnetic layer is a continuous vacuum-deposited TiO layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |