Patent US5321571A successfully refreshed from Google Patents.
US5321571A
Expired / Lapsed
US
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Tape cassette with slider cover rocking mechanism having coil spring retainer portion
Assignee: Kao Corp
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Filing: 1992-12-30
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Granted: 1994-06-14
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Expires: 2012-12-30
Abstract
Abstract A tape cassette comprising a slider slidably covering a lower half of a cassette main body containing a magnetic tape, a lock element of the slider withdrawably inserted into the lower half surface, a locking coil spring for pressing the lock element, and a retainer portion for retaining the locking coil spring to an upper half, wherein: the retainer portion comprises a spring receiving portion and a retainer wall surrounding the spring receiving portion, said retainer wall having a surface inclined toward the spring receiving portion.
Inventors
- 👤 Haruomi Enomoto
- 👤 Yasunori Suda
- 👤 Yoshinobu Machida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:44
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08735
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
129 words
A tape cassette main body adapted to retain a magnetic tape which comprises: an upper half portion and a lower half portion, a slider member slidably covering the lower half portion, said slider member and said lower half portion being provided with aligning apertures therein, a lock element for said slider member extending through said apertures and withdrawably disposed within said lower half portion, a locking coil spring operatively engaging said lock element, and a retainer portion attached to said upper half portion for retaining said locking coil spring to said upper half portion, said retainer portion comprising a retainer wall surrounding a surface portion of the upper half portion to define a spring receiving portion, said retaining wall having a surface which declines toward said spring receiving portion.
Claim 2
Dependent Claim
129 words
A tape cassette main body adapted to retain a magnetic tape which comprises: an upper half portion and a lower half portion, a slider member slidably covering the lower half portion, said slider member and said lower half portion being provided with aligning apertures therein, a lock element for said slider member extending through said apertures and withdrawably disposed within said lower half portion, a locking coil spring operatively engaging said lock element, and a retainer portion attached to said upper half portion for retaining said locking coil spring to said upper half portion, said retainer portion comprising a retainer wall surrounding a surface portion of the upper half portion to define a spring receiving portion, said retaining wall having a surface which declines toward said spring receiving portion.
Claim 3
Dependent Claim
21 words
The tape cassette of claim 1 wherein the retainer wall comprises a plurality of radially disposed and equally spaced-apart declining surfaces.
Claim 4
Dependent Claim
21 words
The tape cassette of claim 2 wherein the retainer wall comprises at least three radially disposed and equally spaced-apart declining surfaces.
Claim 5
Dependent Claim
20 words
The tape cassette of claim 1 wherein the surface of said retaining wall is inclined at an angle of 30°-60°.
Claim 6
Dependent Claim
14 words
The tape cassette of claim 1 wherein the retainer wall has a semi-spherical configuration.
References Cited (Backward Citations)
US4881137A
Cited
US5143317A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-06-13 | 1997-12-13 | 1998-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-13 | 2001-12-13 | 2002-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-13 | 2005-12-13 | 2006-06-14 | $7700.00 | Window Closed / Lapsed |