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US4724501A
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Jacket for floppy disk
Assignee: Carl Freudenberg KG
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Filing: 1985-03-25
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Granted: 1988-02-09
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Expires: 2005-03-25
Abstract
Abstract A jacket for a floppy disk consists essentially of a porous nonwoven material both for a writable cover function and a soft, fibrous liner function.
Inventors
- 👤 Holger Buchwald
- 👤 Werner Schafer
- 👤 Peter Hartwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:59
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/03; G11B23/033; G11B23/0332
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
62 words
A floppy disk jacket consisting essentially of a porous, nonwoven fabric, the nonwoven fabric being in at least one layer having, when formed into a jacket, a writably-smooth and wear-resistant, highly-porous but finely-porous exterior, and a soft, porous, fibrous inner side for facing a floppy disk in the jacket, for providing an exchange of moisture through the jacket but not just penetration.
Claim 2
Dependent Claim
62 words
A floppy disk jacket consisting essentially of a porous, nonwoven fabric, the nonwoven fabric being in at least one layer having, when formed into a jacket, a writably-smooth and wear-resistant, highly-porous but finely-porous exterior, and a soft, porous, fibrous inner side for facing a floppy disk in the jacket, for providing an exchange of moisture through the jacket but not just penetration.
Claim 3
Dependent Claim
27 words
The floppy disk jacket of claim 1, wherein both the electrical surface resistance and resistance in depth of the nonwoven fabric does not exceed 10 9 ohms.
Claim 4
Dependent Claim
23 words
The floppy disk jacket of claim 2, wherein the nonwoven fabric contains fibers filled with electrically conductive material sufficiently for providing the resistances.
Claim 5
Dependent Claim
23 words
The floppy disk jacket of claim 1, wherein the nonwoven fabric is made of polyester, polyamide, polyolefin, PVC, heterofil fibers or mixtures thereof.
Claim 6
Dependent Claim
27 words
The floppy disk jacket of claim 4, wherein both the electrical surface resistance and resistance in depth of the nonwoven fabric does not exceed 10 9 ohms.
Claim 7
Dependent Claim
17 words
The floppy disk jackets of claim 4, wherein the nonwoven fabric has more than one nonwoven layer.
Claim 8
Dependent Claim
27 words
The floppy disk jacket of claim 6, wherein both the electrical surface resistance and resistance in depth of the nonwoven fabric does not exceed 10 9 ohms.
Claim 9
Dependent Claim
16 words
The floppy disk jacket of claim 6, wherein the nonwoven layers are spot-welded to one another.
Claim 10
Dependent Claim
27 words
The floppy disk jacket of claim 8, wherein both the electrical surface resistance and resistance in depth of the nonwoven fabric does not exceed 10 9 ohms.
Claim 11
Dependent Claim
17 words
The floppy disk jackets of claim 1, wherein the nonwoven fabric has more than one nonwoven layer.
Claim 12
Dependent Claim
27 words
The floppy disk jacket of claim 10, wherein both the electrical surface resistance and resistance in depth of the nonwoven fabric does not exceed 10 9 ohms.
Claim 13
Dependent Claim
23 words
The floppy disk jacket of claim 11, wherein the nonwoven fabric contains fibers filled with electrically conductive material sufficiently for providing the resistances.
Claim 14
Dependent Claim
16 words
The floppy disk jacket of claim 10, wherein the nonwoven layers are spot-welded to one another.
Claim 15
Dependent Claim
27 words
The floppy disk jacket of claim 13, wherein both the electrical surface resistance and resistance in depth of the nonwoven fabric does not exceed 10 9 ohms.
Claim 16
Dependent Claim
23 words
The floppy disk jacket of claim 14, wherein the nonwoven fabric contains fibers filled with electrically conductive material sufficiently for providing the resistances.
References Cited (Backward Citations)
JPS5794966A
Cited
GB2096194A
Cited
US4413298A
Cited
JPS581864A
Cited
US4414597A
Cited
US4568994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-08 | 1991-08-10 | 1992-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-08 | 1995-08-10 | 1996-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-08 | 1999-08-10 | 2000-02-09 | $7700.00 | Window Closed / Lapsed |