US4101096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape cassette
Assignee: Fujifilm Holdings Corp
•
Filing: 1976-09-15
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Granted: 1978-07-18
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Expires: 1996-09-15
Abstract
Abstract A magnetic tape cassette including a cushion sheet so embossed and convexly curved that the sheet may bear against edge portions of a magnetic tape in order to avoid an occurrence of breakage or creases in the edge portions and to correct displacement thereof in the direction of the width of the tape.
Inventors
- 👤 Kengo Oishi
- 👤 Osamu Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:08
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08757; G11B23/08764; Y; Y10; Y10S; Y10S242/00; Y10S242/90; Y10S242/914
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
164 words
In a magnetic tape cassette unit of the type having at least one reel therein for reeling and unreeling a magnetic tape thereon, said reel being disposed in a housing having an upper wall and a lower wall confining said tape, the improvement comprising a plurality of elastically tensioned sheets, each having embossed projections projecting from a surface thereof, said projections positioned on said surface to press the tape edges along an axis parallel to the axis of said reel to maintain said tape in preferred position in the width direction thereof, said sheets being curved at a radius of curvature to elastically urge said projections against said tape edges, and wherein: said sheets each having a thickness in the range of 50 μ to 150 μ and said embossed projections have an overall diameter in the range of 1mm to 10mm, a projection height in the range of 5 μ to 20 μ and a pitch in the range of 1mm to 10mm.
Claim 2
Dependent Claim
164 words
In a magnetic tape cassette unit of the type having at least one reel therein for reeling and unreeling a magnetic tape thereon, said reel being disposed in a housing having an upper wall and a lower wall confining said tape, the improvement comprising a plurality of elastically tensioned sheets, each having embossed projections projecting from a surface thereof, said projections positioned on said surface to press the tape edges along an axis parallel to the axis of said reel to maintain said tape in preferred position in the width direction thereof, said sheets being curved at a radius of curvature to elastically urge said projections against said tape edges, and wherein: said sheets each having a thickness in the range of 50 μ to 150 μ and said embossed projections have an overall diameter in the range of 1mm to 10mm, a projection height in the range of 5 μ to 20 μ and a pitch in the range of 1mm to 10mm.
Claim 3
Dependent Claim
61 words
A magnetic tape cassette unit as claimed in claim 1 wherein said plurality of sheets comprises a first sheet positioned in the space between the tape edge when reeled on said reel and the upper wall of said housing, and a second sheet positioned in the space between the opposite tape edge when reeled on said reel and the lower wall.
Claim 4
Dependent Claim
44 words
A magnetic tape cassette unit as claimed in claim 2 wherein each said sheet is formed of a plastic material and said overall radius of curvature is large enough to cause the said sheet to press between its respective wall and a tape edge.
Claim 5
Dependent Claim
29 words
A magnetic tape cassette unit as claimed in claim 3 wherein said embossed projections are disposed across said entire surface and face said tape edges in direct contact therewith.
Claim 6
Dependent Claim
35 words
A magnetic tape cassette unit as claimed in claim 3 wherein said embossed projections face said tape edges, and further comprising a pair of smooth plates positioned between said projections and said tape edges, respectively.
Claim 7
Dependent Claim
49 words
A magnetic tape cassette unit as claimed in claim 1 wherein said embossed projections have dimensions in the inclusive ranges as follows: (a) projection overall diameter - 2 mm to 5 mm; (b) projection height - 7 μ to 15 μ; (c) pitch - 2 mm to 5 mm.
Claim 8
Dependent Claim
40 words
A magnetic tape cassette unit as claimed in claim 3 wherein each said sheet is made from a material selected from the group consisting of, polyethylene, teflon, styrene, polypropylene vinyl chloride, vinyl acetate, polyethylene terephthalate, fiber triacetate, or synthetic paper.
References Cited (Backward Citations)
US3606203A
Cited
US3556433A
Cited
US3556434A
Cited
US3791608A
Cited
US3712559A
Cited
US3826489A
Cited
DE2501914A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |