Patent US4640863A successfully refreshed from Google Patents.
US4640863A
Expired / Lapsed
US
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Magnetic recording media
Assignee: Victor Company of Japan Ltd
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Filing: 1984-04-27
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Granted: 1987-02-03
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Expires: 2004-04-27
Abstract
Abstract A magnetic recording medium comprising a flexible support and a magnetic layer formed on the flexible support. The flexible support is made of a resin composition which comprises thermoplastic resins and particles of titanium monoxide or dititanium trioxide. The particles are dispersed in the thermoplastic resin in an amount of 0.03 to 10 wt % of the composition and have an average size below 2.5 mu m.
Inventors
- 👤 Yukio Matsumoto
- 👤 Masaru Hanayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:57
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/708; G11B5/73; G11B5/739; G11B5/73923; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
70 words
A magnetic recording medium which comprises a flexible support and a magnetic layer formed on the flexible support, the flexible support being made of a resin composition which comprises a thermoplastic resin and particles selected from the group consisting of titanium monoxide and dititanium trioxide dispersed in the thermoplastic resin in an amount of 0.03 to 10 wt% of the composition, said particles having an average size below 2.5 μm.
Claim 2
Dependent Claim
70 words
A magnetic recording medium which comprises a flexible support and a magnetic layer formed on the flexible support, the flexible support being made of a resin composition which comprises a thermoplastic resin and particles selected from the group consisting of titanium monoxide and dititanium trioxide dispersed in the thermoplastic resin in an amount of 0.03 to 10 wt% of the composition, said particles having an average size below 2.5 μm.
Claim 3
Dependent Claim
85 words
In a magnetic recording medium which comprises a flexible support and a magnetic layer formed on the flexible support, the flexible support being made of a resin composition which comprises a thermoplastic resin and particles of titanium oxide which are dispersed in the thermoplastic resin in an amount of 0.03 to 10 wt% of the composition and which have an average size below 2.5 microns, the improvement characterized in that said titanium oxide is selected from the group consisting of titanium monoxide and dititanium trioxide.
Claim 4
Dependent Claim
85 words
In a magnetic recording medium which comprises a flexible support and a magnetic layer formed on the flexible support, the flexible support being made of a resin composition which comprises a thermoplastic resin and particles of titanium oxide which are dispersed in the thermoplastic resin in an amount of 0.03 to 10 wt% of the composition and which have an average size below 2.5 microns, the improvement characterized in that said titanium oxide is selected from the group consisting of titanium monoxide and dititanium trioxide.
Claim 5
Dependent Claim
21 words
The magnetic recording medium according to claim 1, wherein the particles have an average size ranging from 0.05 to 1.0 μm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |