US4688128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape cassette having two layered portions
Assignee: TDK Corp
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Filing: 1986-02-04
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Granted: 1987-08-18
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Expires: 2006-02-04
Abstract
Abstract In a magnetic tape cassette comprising upper and lower half casings, at least screw-fastening portions and their neighboring portions at four corners of the upper and lower half casings are formed by a two-layered structure consisting of the first layer of an opaquelayer, a transparent layer or a semitransparent layer and the second layer of a transparent layer or a semitransparent layer which is laminated on the first layer in one piece.
Inventors
- 👤 Haruo Shiba
- 👤 Takateru Sato
- 👤 Kimio Tanaka
- 👤 Yoshiya Sakata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:28
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08785
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
83 words
A magnetic tape cassette comprising upper and lower half casings wherein at least screw-fastening portions and their neighboring portions at four corners of said upper and lower half casings are formed by a two-layered structure consisting of a first layer whose visual characteristic is one of the group consisting of opaque, transparent and semitransparent, and a second layer whose visual characterictic is one of the group consisting of transparent and semitransparent, said second layer being laminated on said first layer in one piece.
Claim 2
Dependent Claim
83 words
A magnetic tape cassette comprising upper and lower half casings wherein at least screw-fastening portions and their neighboring portions at four corners of said upper and lower half casings are formed by a two-layered structure consisting of a first layer whose visual characteristic is one of the group consisting of opaque, transparent and semitransparent, and a second layer whose visual characterictic is one of the group consisting of transparent and semitransparent, said second layer being laminated on said first layer in one piece.
Claim 3
Dependent Claim
28 words
A magnetic tape cassette according to claim 1, wherein tape-quantity observing windows in said half casings are formed by one of a transparent layer and a semitransparent layer.
Claim 4
Dependent Claim
28 words
A magnetic tape cassette according to claim 1, wherein tape-guiding roller windows in said half casings are formed by one of a transparent layer and a semitransparent layer.
Claim 5
Dependent Claim
29 words
A magnetic tape cassette according to claim 1, wherein tape-running direction, indicating windows in said half casings are formed by one of a transparent layer and a semitransparent layer.
Claim 6
Dependent Claim
25 words
A magnetic tape cassette according to claim 1, wherein a thickness of said first layer is substantially the same as that of said second layer.
Claim 7
Dependent Claim
45 words
A magnetic tape cassette according to Claim 1, wherein surface portions on which a character capable of discriminating either an A-surface or a B-surface is shown, which are formed by only said first layer, are substantially in the same level as the outer surface area.
Claim 8
Dependent Claim
51 words
A magnetic tape cassette according to claim 1, wherein in each of said upper and lower half casings, a part of the inner surface area formed by only said first layer is recessed so as to have substantially the same thickness as that of the other part of said first layer.
Claim 9
Dependent Claim
26 words
A magnetic tape cassette according to Claim 2, wherein at least one hub controlling rib is formed integrally with said layer constituting said tape-quantity observing windows.
Claim 10
Dependent Claim
25 words
A magnetic tape cassette according to claim 3, wherein recesess for receiving tape-guiding roller shafts are formed in said layer constituting said tape-guiding roller windows.
Claim 11
Dependent Claim
30 words
A magnetic tape cassette according to claim 1, wherein said upper and lower half casings respectively have a recess for a labelling area which is formed of a two-layered structure.
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) | 1990-08-17 | 1991-02-16 | 1991-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-17 | 1995-02-16 | 1995-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-17 | 1999-02-16 | 1999-08-18 | $7700.00 | Window Closed / Lapsed |