US3721772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape cassette with a removably mounted erasure prevention means having two operative positions
Assignee: Sony Corp
•
Filing: 1970-07-20
•
Granted: 1973-03-20
•
Expires: 1990-07-20
Abstract
Abstract A TAPE CASSETTE FOR USE IN A TAPE RECORDING AND REPRODUCING APPARATUS HAVING A SWITCH ADAPTED TO BE ENGAGED BY THE CASSETTE FOR CONTROLLING THE RECORDING CIRCUIT OF THE APPARATUS AND PLACING THE RECORDING CIRCUIT IN ITS OPERATIVE AND INOPERATIVE MODES. THE CASSETTE HAS A SAFETY DEVICE ADAPTED TO BE REMOVABLY MOUNTED ON THE CASSETTE IN AT LEAST TWO OPERATIVE POSITIONS AND HAS FIRST AND SECOND SWITCH CONTROL SURFACES WHICH ARE SELECTIVELY ADAPTED TO ENGAGE THE SWITCH, THEREBY MAINTAINING THE SWITCH IN ONE OF ITS TWO OPERATIVE POSITIONS TO SELECT THE MODE OF THE RECORDING CIRCUIT.
Inventors
- 👤 Y Miura
- 👤 Y Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:28
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/041; G11B23/042
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |