US4521480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording media of the high recording density type comprising both titanium monoxide and magnetic alloy powders in a magnetic layer
Assignee: Victor Company of Japan Ltd
•
Filing: 1983-08-09
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Granted: 1985-06-04
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Expires: 2003-08-09
Abstract
Abstract A magnetic recording medium of the high recording density type is disclosed, which comprises a support, and a magnetic recording layer formed on at least one side of the support. The magnetic recording layer is made of a dispersion, in a binder, of magnetic alloy particles and TiO particles in an amount of from 0.1 to 20 wt % of said magnetic alloy particles.
Inventors
- 👤 Kuniharu Fujiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:07
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/708; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/256
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
A magnetic recording medium of the high recording density type comprising a support and a magnetic recording layer formed on at least one side of said support, said magnetic recording layer comprising a dispersion in a binder, of magnetic alloy particles and TiO particles, wherein said TiO particles are present in an amount from 0.1 to 20 weight percent of said magnetic alloy particles and have an average size of from 0.01 to 5 microns.
Claim 2
Dependent Claim
75 words
A magnetic recording medium of the high recording density type comprising a support and a magnetic recording layer formed on at least one side of said support, said magnetic recording layer comprising a dispersion in a binder, of magnetic alloy particles and TiO particles, wherein said TiO particles are present in an amount from 0.1 to 20 weight percent of said magnetic alloy particles and have an average size of from 0.01 to 5 microns.
Claim 3
Dependent Claim
18 words
The medium according to claim 1, wherein said support has said magnetic recording layer on one side thereof.
Claim 4
Dependent Claim
18 words
The medium according to claim 1, wherein said support has said magnetic recording layer on each side thereof.
Claim 5
Dependent Claim
21 words
The medium according to claim 1, wherein said magnetic alloy particles have an average size of from 0.01 to 1 micron.
Claim 6
Dependent Claim
42 words
A magnetic recording medium according to claim 1 wherein the magnetic recording layer consists essentially of a dispersion, in a binder, of magnetic alloy particles and TiO particles in an amount from 0.1 to 20 wt. % of said magnetic alloy particles.
Claim 7
Dependent Claim
36 words
A magnetic recording medium according to claim 1 wherein the TiO powder comprises black cubic crystals having a specific gravity of 4.0 to 4.9, a pH of 7.0±1.0 and an electric resistance of 10 -2 ohm-cm.
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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) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |