US4044386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape cassette with erase inhibit plug
Assignee: TDK Corp
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Filing: 1976-04-22
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Granted: 1977-08-23
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Expires: 1996-04-22
Abstract
Abstract A tape cassette characterized by a bias changeover slot located adjacent to an accidental erasure preventive slot wherein, when the accidental erasure preventive slot is kept in an inoperative state, a U-shaped snap is secured in such slot so that the base of the U-shaped snap is disposed to cover the opening of the accidental erasure preventive slot, and when the slot is to be kept in an operative state, the U-shaped snap is secured in the slot so that the base of the U-shaped snap is arranged against the wall of the slot located opposite the adjacent bias changeover slot, whereby the accidental erasure preventive slot is uncovered and the snap is secured within the cassette.
Inventors
- 👤 Takateru Satou
- 👤 Haruo Shiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:54
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/30; G11B15/00; G11B15/02; G11B15/05; G11B15/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
159 words
A tape cassette comprising: means defining an accidental erasure preventive slot having at least one ridge member and at least one projecting member on an internal wall thereof; means defining a bias changeover slot adjacent to said accidental erasure preventive slot and a U-shaped snap for selectively closing and opening said accidental erasure preventive slot while not disturbing said bias changeover slot and having a base and two arms upstanding therefrom; means for retaining said U-shaped snap within the accidental erasure preventive slot in either of two positions whereby said base of U-shaped snap is disposed at the opening of the accidental erasure preventive slot when the said accidental erasure preventive slot is to be kept in an inoperative state, and said base of the U-shaped snap is set against the wall of the accidental erasure preventive slot being disposed opposite the bias changeover slot when said accidental erasure preventive slot is to be kept in an operative state.
Claim 2
Dependent Claim
159 words
A tape cassette comprising: means defining an accidental erasure preventive slot having at least one ridge member and at least one projecting member on an internal wall thereof; means defining a bias changeover slot adjacent to said accidental erasure preventive slot and a U-shaped snap for selectively closing and opening said accidental erasure preventive slot while not disturbing said bias changeover slot and having a base and two arms upstanding therefrom; means for retaining said U-shaped snap within the accidental erasure preventive slot in either of two positions whereby said base of U-shaped snap is disposed at the opening of the accidental erasure preventive slot when the said accidental erasure preventive slot is to be kept in an inoperative state, and said base of the U-shaped snap is set against the wall of the accidental erasure preventive slot being disposed opposite the bias changeover slot when said accidental erasure preventive slot is to be kept in an operative state.
Claim 3
Dependent Claim
29 words
The tape cassette according to claim 1, wherein the accidental erasure preventive slot is larger than the bias changeover slot, and a step is formed between the two slots.
Claim 4
Dependent Claim
31 words
The tape cassette according to claim 2, wherein the U-shaped snap further comprises a square projection having a hollow central portion disposed on at least one of said upstanding arms thereof.
Claim 5
Dependent Claim
37 words
The tape cassette according to claim 3, wherein the length of said square projection is approximately equal to the distance from an end of said ridge in the slot to said step formed between said two slots.
References Cited (Backward Citations)
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Cited
US3688057A
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US3686470A
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US3826489A
Cited
US3777074A
Cited
US3848265A
Cited
US3950786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |