US3337693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chopper demodulator system for direct-record tape recorders
Assignee: Individual
•
Filing: 1964-06-30
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Granted: 1967-08-22
•
Expires: 1984-06-30
Abstract
No abstract record available.
Inventors
- 👤 Silverstein Abraham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:09
CPC Classifications
G; G11; G11B; G11B5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A RECORD-PLAYBACK SYSTEM COMPRISING: (A) AN INFORMATION SIGNAL SOURCE, (B) A REFERENCE VOLTAGE SOURCE, (C) CHOPPER MEANS CONNECTED TO SAID REFERENCE AND SIGNAL SOURCES FOR SYNCHRONOUSLY REVERSEAL CHOPPING SIGNALS FROM THE REFERENCE VOLTAGE AND SIGNAL VOLTAGE SOURCES, (D) TAPE RECORDER MEANS COUPLED TO SAID REFERENCE AND SIGNAL SOURCES FOR RECORDING THE CHOPPED SIGNALS ON SEPARATE CHANNELS OF A MAGNETIC TAPE, (E) PLAYBACK MEANS FOR REPRODUCING SIGNALS RECORDED IN SAID SEPARATE CHANNELS, (F) MEANS FOR ALGEBRAICALLY ADDING THE CHOPPED SIGNALS IN EACH CHANNEL, (G) FIRST MEANS COUPLED TO THE ADDED SIGNALS FOR FULL WAVE RECTIFYING SAID ADDED SIGNALS IN A POSITIVE SENSE, AND (H) SECOND MEANS COUPLED TO THE REVERSAL CHOPPED REFERENCE VOLTAGE CHANNEL FOR FULL WAVE RECTIFYING THE REVERSAL CHOPPED REFERENCE VOLTAGE IN A POSITIVE SENSE, AND (I) MEANS FOR AMPLIFYING THE SEPARATELY RECTIFIED VOLTAGES IN A DIFFERENTIAL AMPLIFIER WHEREBY THE CHOPPED REFERENCE VOLTAGE IN EACH CHANNEL CANCELS AND LEAVES A REPRODUCTION OF THE INFORMATION SIGNAL FROM SAID SIGNAL SOURCE.
Claim 2
Dependent Claim
160 words
A RECORD-PLAYBACK SYSTEM COMPRISING: (A) AN INFORMATION SIGNAL SOURCE, (B) A REFERENCE VOLTAGE SOURCE, (C) CHOPPER MEANS CONNECTED TO SAID REFERENCE AND SIGNAL SOURCES FOR SYNCHRONOUSLY REVERSEAL CHOPPING SIGNALS FROM THE REFERENCE VOLTAGE AND SIGNAL VOLTAGE SOURCES, (D) TAPE RECORDER MEANS COUPLED TO SAID REFERENCE AND SIGNAL SOURCES FOR RECORDING THE CHOPPED SIGNALS ON SEPARATE CHANNELS OF A MAGNETIC TAPE, (E) PLAYBACK MEANS FOR REPRODUCING SIGNALS RECORDED IN SAID SEPARATE CHANNELS, (F) MEANS FOR ALGEBRAICALLY ADDING THE CHOPPED SIGNALS IN EACH CHANNEL, (G) FIRST MEANS COUPLED TO THE ADDED SIGNALS FOR FULL WAVE RECTIFYING SAID ADDED SIGNALS IN A POSITIVE SENSE, AND (H) SECOND MEANS COUPLED TO THE REVERSAL CHOPPED REFERENCE VOLTAGE CHANNEL FOR FULL WAVE RECTIFYING THE REVERSAL CHOPPED REFERENCE VOLTAGE IN A POSITIVE SENSE, AND (I) MEANS FOR AMPLIFYING THE SEPARATELY RECTIFIED VOLTAGES IN A DIFFERENTIAL AMPLIFIER WHEREBY THE CHOPPED REFERENCE VOLTAGE IN EACH CHANNEL CANCELS AND LEAVES A REPRODUCTION OF THE INFORMATION SIGNAL FROM SAID SIGNAL SOURCE.
References Cited (Backward Citations)
US2985840A
Cited
US3084011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |