Patent US4053935A successfully refreshed from Google Patents.
US4053935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape cassette with flexible aperture closure
Assignee: TDK Corp
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Filing: 1976-04-22
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Granted: 1977-10-11
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Expires: 1996-04-22
Abstract
Abstract A tape cassette characterized by a bias changeover slot being disposed adjacent to an accidental erasure protective slot and wherein a blocking element for covering an opening of the accidental erasure protective slot is securable on the wall thereof which is disposed opposite the bias changeover slot.
Inventors
- 👤 Haruo Shiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:47
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/05; G11B15/06; Y; Y10; Y10S; Y10S206/00; Y10S206/816
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
122 words
A tape cassette comprising: a cassette body, a bias changeover slot disposed in the cassette body, an accidental erasure preventive slot disposed in the cassette body adjacent to the bias changeover slot, a storage slot disposed adjacent to the accidental erasure preventive slot, the storage slot having a curved portion, an elongated cover element disposed at least partially in the storage slot, the elongated cover element having a first position blocking the accidental erasure preventive slot and a second position opening the accidental erasure preventive slot, the elongated cover element being bendable so as to be able to travel in the curved portion of the storage slot as the elongated cover element is moved from its first position to its second position.
Claim 2
Dependent Claim
122 words
A tape cassette comprising: a cassette body, a bias changeover slot disposed in the cassette body, an accidental erasure preventive slot disposed in the cassette body adjacent to the bias changeover slot, a storage slot disposed adjacent to the accidental erasure preventive slot, the storage slot having a curved portion, an elongated cover element disposed at least partially in the storage slot, the elongated cover element having a first position blocking the accidental erasure preventive slot and a second position opening the accidental erasure preventive slot, the elongated cover element being bendable so as to be able to travel in the curved portion of the storage slot as the elongated cover element is moved from its first position to its second position.
Claim 3
Dependent Claim
18 words
A tape cassette in accordance with claim 1 wherein the elongated cover element comprises an elongated plastic bellows.--
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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |