US4680661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic disk cartridge
Assignee: Fujifilm Holdings Corp
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Filing: 1985-12-26
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Granted: 1987-07-14
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Expires: 2005-12-26
Abstract
Abstract A magnetic disk cartridge comprises a case, a flexible magnetic disk sheet rotatably housed in the case, and at least one liner secured to an inner wall surface of the case facing the magnetic disk sheet so that the liner contacts the magnetic disk sheet. The liner is constituted by a nonwoven fabric for contact with the magnetic disk sheet, and a chemical dust attraction layer secured to the inner wall surface of the case.
Inventors
- 👤 Kengo Oishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:23
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/50; G11B23/505; G11B23/02; G11B23/03; G11B23/033; G11B23/0332
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
A magnetic disk cartridge having a case, a flexible magnetic disk sheet rotatably housed in the case, and at least one liner secured to an inner wall surface of the case facing the magnetic disk sheet so that the liner contacts the magnetic disk sheet, wherein said liner is constituted by two superimposed layers, one of the layers being a nonwoven fabric layer for contact with said magnetic disk sheet, and the other layer being a chemical dust attraction layer secured to the inner wall surface of said case.
Claim 2
Dependent Claim
89 words
A magnetic disk cartridge having a case, a flexible magnetic disk sheet rotatably housed in the case, and at least one liner secured to an inner wall surface of the case facing the magnetic disk sheet so that the liner contacts the magnetic disk sheet, wherein said liner is constituted by two superimposed layers, one of the layers being a nonwoven fabric layer for contact with said magnetic disk sheet, and the other layer being a chemical dust attraction layer secured to the inner wall surface of said case.
Claim 3
Dependent Claim
35 words
A magnetic disk cartridge as defined in claim 1 wherein said chemical dust attraction layer is constituted by a cloth impregnated with an emulsion prepared by mixing a surface-active agent, a mineral oil and water.
Claim 4
Dependent Claim
22 words
A magnetic disk cartridge as defined in claim 1 or 2 wherein said nonwoven fabric layer is constituted by an oil-repellent material.
Claim 5
Dependent Claim
36 words
A magnetic disk cartridge as defined in claim 1 or 2 wherein said liner is formed in an approximately ringlike shape and provided with an aperture matching an aperture of said case for magnetic head insertion.
Claim 6
Dependent Claim
27 words
A magnetic disk cartridge as defined in claim 2 wherein said surface-active agent is selected from the group consisting of nonionic surface-active agents and cationic surface-active agents.
References Cited (Backward Citations)
US3668658A
Cited
JPS4865765A
Cited
JPS4966706A
Cited
US3864755A
Cited
DE2545091A1
Cited
JPS5218707A
Cited
JPS55163244A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |