US3071648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereo amplifier apparatus and the like
Assignee: —
•
Filing: —
•
Granted: 1963-01-01
•
Expires: 1980-01-01
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:58
CPC Classifications
H; H04; H04S; H04S1/00; H04R; H04R5/00; H04R5/033; H04R5/04; H04S1/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
236 words
ELECTRICAL APPARATUS HAVING, IN COMBINATION, A PAIR OF SIGNAL TRANSMISSION CHANNELS EACH PROVIDED WITH FIRST AND SECOND SETS OF AMPLIFIER STAGES AND SIGNAL-LEVEL INDICATING MEANS CONNECTED THERETO, MEANS FOR APPLYING A PAIR OF SIGNALS TO THE FIRST SET OF AMPLIFIER STAGES OF THE PAIR OF CHANNELS, MULTIPLE-POSITION SWITCHING MEANS INTERPOSED IN EACH CHANNEL BETWEEN THE FIRST AND SECOND SETS OF AMPLIFIER STAGES THEREOF, THE SWITCHING MEANS IN A FIRST OF THE MULTIPLE POSITIONS CONNECTING THE FIRST SET OF AMPLIFIER STAGES OF THE CHANNELS TOGETHER AND TO THE SECOND SET OF AMPLIFIER STAGES OF ONE OF THE CHANNELS, THE SWITCHING MEANS IN A SECOND POSITION CONNECTING THE FIRST SET OF AMPLIFIER STAGES OF THE CHANNELS TOGETHER AND TO THE SECOND SET OF AMPLIFIER STAGES OF THE OTHER CHANNEL, MEANS OPERATIVE AS THE SWITCHING MEANS IS SWITCHED BACK AND FORTH BETWEEN THE SAID FIRST AND SECOND POSITIONS FOR ADJUSTING BOTH THE LEVEL AND OVER-ALL FREQUENCY RESPONSE OF THE SECOND SET OF AMPLIFIER STAGES OF EACH CHANNEL IN ORDER TO BALANCE THE SAME IN ACCORDANCE WITH THE INDICATIONS OF THE SIGNAL-LEVEL INDICATING MEANS AND THE SWITCHING MEANS HAVING A FURTHER POSITION FOR THEREUPON CONNECTING THE FIRST SET OF AMPLIFIER STAGES OF EACH CHANNEL TO THE SECOND SET OF AMPLIFIER STAGES THEREOF IN ORDER TO TRANSMIT THE SIGNALS IN THE FIRST SET OF AMPLIFIER STAGES OF EACH CHANNEL ONLY TO THE CORRESPONDING SECOND SET OF AMPLIFIER STAGES OF THAT CHANNEL.
Claim 2
Dependent Claim
236 words
ELECTRICAL APPARATUS HAVING, IN COMBINATION, A PAIR OF SIGNAL TRANSMISSION CHANNELS EACH PROVIDED WITH FIRST AND SECOND SETS OF AMPLIFIER STAGES AND SIGNAL-LEVEL INDICATING MEANS CONNECTED THERETO, MEANS FOR APPLYING A PAIR OF SIGNALS TO THE FIRST SET OF AMPLIFIER STAGES OF THE PAIR OF CHANNELS, MULTIPLE-POSITION SWITCHING MEANS INTERPOSED IN EACH CHANNEL BETWEEN THE FIRST AND SECOND SETS OF AMPLIFIER STAGES THEREOF, THE SWITCHING MEANS IN A FIRST OF THE MULTIPLE POSITIONS CONNECTING THE FIRST SET OF AMPLIFIER STAGES OF THE CHANNELS TOGETHER AND TO THE SECOND SET OF AMPLIFIER STAGES OF ONE OF THE CHANNELS, THE SWITCHING MEANS IN A SECOND POSITION CONNECTING THE FIRST SET OF AMPLIFIER STAGES OF THE CHANNELS TOGETHER AND TO THE SECOND SET OF AMPLIFIER STAGES OF THE OTHER CHANNEL, MEANS OPERATIVE AS THE SWITCHING MEANS IS SWITCHED BACK AND FORTH BETWEEN THE SAID FIRST AND SECOND POSITIONS FOR ADJUSTING BOTH THE LEVEL AND OVER-ALL FREQUENCY RESPONSE OF THE SECOND SET OF AMPLIFIER STAGES OF EACH CHANNEL IN ORDER TO BALANCE THE SAME IN ACCORDANCE WITH THE INDICATIONS OF THE SIGNAL-LEVEL INDICATING MEANS AND THE SWITCHING MEANS HAVING A FURTHER POSITION FOR THEREUPON CONNECTING THE FIRST SET OF AMPLIFIER STAGES OF EACH CHANNEL TO THE SECOND SET OF AMPLIFIER STAGES THEREOF IN ORDER TO TRANSMIT THE SIGNALS IN THE FIRST SET OF AMPLIFIER STAGES OF EACH CHANNEL ONLY TO THE CORRESPONDING SECOND SET OF AMPLIFIER STAGES OF THAT CHANNEL.
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) | 1965-12-31 | 1966-07-02 | 1967-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-31 | 1970-07-02 | 1971-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-31 | 1974-07-02 | 1975-01-01 | $7700.00 | Window Closed / Lapsed |