US4515856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording media comprising titanium monoxide and carbon black powders in a magnetic recording layer
Assignee: Victor Company of Japan Ltd
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Filing: 1983-08-08
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Granted: 1985-05-07
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Expires: 2003-08-08
Abstract
Abstract Magnetic recording media comprising a combination of titanium monoxide and carbon black powders in specific amounts along with magnetic particles dispersed in a resin binder are disclosed.
Inventors
- 👤 Ikuo Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:52
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
93 words
A magnetic recording medium comprising a support, and a magnetic recording layer formed on at least one side of said support, said magnetic recording layer comprising a dispersion of magnetic particles, and a mixture of about 0.1 to 20 weight percent of a titanium monoxide powder and about 1 to 10 weight percent of a carbon black powder, both based on said magnetic particles, in a resin binder, wherein the titanium monoxide and carbon black powders have average particle sizes of from 0.01 to 5 microns and from 13 to 50 millimicrons, respectively.
Claim 2
Dependent Claim
93 words
A magnetic recording medium comprising a support, and a magnetic recording layer formed on at least one side of said support, said magnetic recording layer comprising a dispersion of magnetic particles, and a mixture of about 0.1 to 20 weight percent of a titanium monoxide powder and about 1 to 10 weight percent of a carbon black powder, both based on said magnetic particles, in a resin binder, wherein the titanium monoxide and carbon black powders have average particle sizes of from 0.01 to 5 microns and from 13 to 50 millimicrons, respectively.
Claim 3
Dependent Claim
20 words
A magnetic recording medium according to claim 1, wherein said support has the magnetic recording layer on one side thereof.
Claim 4
Dependent Claim
20 words
A magnetic recording medium according to claim 1, wherein said support has the magnetic recording layer on each side thereof.
Claim 5
Dependent Claim
41 words
A magnetic recording medium according to claim 1, wherein the amounts of the titanium monoxide and carbon black powders are, respectively, in ranges of from about 3 to 10 wt% and from about 1 to 5 wt% of said magnetic particles.
Claim 6
Dependent Claim
61 words
A magnetic recording medium according to claim 1 wherein said magnetic recording layer consists essentially of a dispersion of magnetic particles, and a mixture of about 0.1 to 20 weight percent of a titanium monoxide powder and about 1 to 10 weight percent of a carbon black powder, both based on the amount of said magnetic particles, in a resin binder.
Claim 7
Dependent Claim
37 words
A magnetic recording medium according to claim 1 wherein the titanium monoxide 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) | 1988-05-06 | 1988-11-05 | 1989-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-06 | 1992-11-05 | 1993-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-06 | 1996-11-05 | 1997-05-07 | $7700.00 | Window Closed / Lapsed |