Patent US2819566A successfully refreshed from Google Patents.
US3588375A
Expired / Lapsed
US
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Multichannel tape recorder with double recording prevention means
Assignee: Leach Corp
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Filing: 1970-01-14
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Granted: 1971-06-28
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Expires: 1990-01-14
Abstract
Abstract TAPE RECORDER FOR TWO OR MORE RECORDING CHANNELS HAVING A MULTITRACK READ-WRITE RECORDING HEAD, VOLUME CONTROLS FOR VARYING THE INTENSITY OF THE ELECTRIC RECORDING AND REPRODUCING SIGNALS, VISIBLE INDICATORS FOR INDICATING THE MAGNITUDE OF SUCH SIGNALS, AND A READ HEAD FOR MONITORING THE RECORDED INFORMATION IMMEDIATELY AFTER IT HAS BEEN RECORDED. A SELECTOR SWITCH PERMITS THE ALTERNATIVE REPLAY OF ALL CHANNELS INDIVIDUALLY OR SIMULTANEOUSLY. THE RECORDER HAS PROVISION TO POSITIVELY PREVENT THE READ-WRITE RECORDING HEAD FROM RECORDING ANY INFORMATION IF THE TAPE HAS INFORMATION ALREADY RECORDED THEREON.
Inventors
- 👤 Carl L Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:02
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/36; G11B15/00; G11B15/02; G11B15/04
Claims Analysis
Total Claims: 0
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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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |