US3223790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dubbing circuits for magnetic recorders with means for reducing feedback
Assignee: US Philips Corp
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Filing: 1962-02-08
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Granted: 1965-12-14
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Expires: 1982-02-08
Abstract
No abstract record available.
Inventors
- 👤 Brandt Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:46
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/04; G05B19/12; G05B19/14; G11; G11B; G11B23/00; G11B23/0007; G11B27/00; G11B27/02; G11B27/022; G11B27/029; H; H01; H01H; H01H43/00; H01H43/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
APPARATUS FOR DUBBING SIGNALS RECORDED ON ONE TRACK OF THE TAPE OF A MAGNETIC RECORDER ONTO A SECOND TRACK OF THE SAME TAPE, COMPRISING: A REPRODUCING HEAD SCANNING ONE TRACK OF A MAGNETIC TAPE, A RECORDING HEAD FOR RECORDING SIGNALS ON A SECOND TRACK OF THE SAME MAGNETIC TAPE, FIRST AND SECOND SIGNAL COILS ASSOCIATED WITH SAID REPRODUCING AND RECORDING HEADS RESPECTIVELY, A FIRST CAPACITOR CONNECTED IN PARALLEL WITH SAID FIRST SIGNAL COIL, FIRST AMPLIFIER MEANS FOR AMPLIFYING THE SIGNALS FROM SAID FIRST COIL, SECOND AMPLIFIER MEANS FOR AMPLIFYING THE SIGNALS APPLIED TO SAID SECOND SIGNAL COIL, SAID SECOND AMPLIFIER MEANS COMPRISING A PLURALITY OF STAGES ONE OF WHICH INCLUDES A TUNED FILTER, AND A RESISTOR COUPLING BETWEEN THE OUTPUT OF SAID FIRST AMPLIFIER MEANS AND AN INPUT OF SAID ONE STAGE OF THE SECOND AMPLIFIER MEANS,
Claim 2
Dependent Claim
137 words
APPARATUS FOR DUBBING SIGNALS RECORDED ON ONE TRACK OF THE TAPE OF A MAGNETIC RECORDER ONTO A SECOND TRACK OF THE SAME TAPE, COMPRISING: A REPRODUCING HEAD SCANNING ONE TRACK OF A MAGNETIC TAPE, A RECORDING HEAD FOR RECORDING SIGNALS ON A SECOND TRACK OF THE SAME MAGNETIC TAPE, FIRST AND SECOND SIGNAL COILS ASSOCIATED WITH SAID REPRODUCING AND RECORDING HEADS RESPECTIVELY, A FIRST CAPACITOR CONNECTED IN PARALLEL WITH SAID FIRST SIGNAL COIL, FIRST AMPLIFIER MEANS FOR AMPLIFYING THE SIGNALS FROM SAID FIRST COIL, SECOND AMPLIFIER MEANS FOR AMPLIFYING THE SIGNALS APPLIED TO SAID SECOND SIGNAL COIL, SAID SECOND AMPLIFIER MEANS COMPRISING A PLURALITY OF STAGES ONE OF WHICH INCLUDES A TUNED FILTER, AND A RESISTOR COUPLING BETWEEN THE OUTPUT OF SAID FIRST AMPLIFIER MEANS AND AN INPUT OF SAID ONE STAGE OF THE SECOND AMPLIFIER MEANS,
References Cited (Backward Citations)
US2733301A
Cited
US2213246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |