Patent US3135830A successfully refreshed from Google Patents.
US3135830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereophonic amplifier system
Assignee: Motorola Solutions Inc
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Filing: 1961-07-12
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Granted: 1964-06-02
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Expires: 1981-07-12
Abstract
No abstract record available.
Inventors
- 👤 Starai Rudolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:30
CPC Classifications
H; H04; H04R; H04R5/00; H04R5/04; H03; H03G; H03G3/00; H03G3/02; H03G3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
STEREOPHONIC SOUND SIGNAL UTILIZATION APPARATUS INCLUDING IN COMBINATION, FIRST AND SECOND AMPLIFIER CHANNELS FOR CONDUCTING RESPECTIVE STEREOPHONIC SOUND SIGNALS, A BALANCE POTENTIOMETER HAVING A CONTINUOUS RESISTANCE ELEMENT WITH THE ENDS THEREOF CONNECTED RESPECTIVELY TO SAID AMPLIFIER CHANNELS, SAID POTENTIOMETER FURTHER HAVING A FIXED CENTER TAP AND A MANUALLY VARIABLE TAP BOTH CONNECTED TO A REFERENCE POINT FOR SAID APPARATUS, SAID VARIABLE TAP BEING ADJUSTABLE OVER SUBSTANTIALLY THE FULL LENGTH OF SAID RESISTANCE ELEMENT TO BALANCE THE AMPLIFICATION LEVEL OF SIGNALS IN EITHER OF SAID CHANNELS WITH RESPECT
Claim 2
Dependent Claim
87 words
STEREOPHONIC SOUND SIGNAL UTILIZATION APPARATUS INCLUDING IN COMBINATION, FIRST AND SECOND AMPLIFIER CHANNELS FOR CONDUCTING RESPECTIVE STEREOPHONIC SOUND SIGNALS, A BALANCE POTENTIOMETER HAVING A CONTINUOUS RESISTANCE ELEMENT WITH THE ENDS THEREOF CONNECTED RESPECTIVELY TO SAID AMPLIFIER CHANNELS, SAID POTENTIOMETER FURTHER HAVING A FIXED CENTER TAP AND A MANUALLY VARIABLE TAP BOTH CONNECTED TO A REFERENCE POINT FOR SAID APPARATUS, SAID VARIABLE TAP BEING ADJUSTABLE OVER SUBSTANTIALLY THE FULL LENGTH OF SAID RESISTANCE ELEMENT TO BALANCE THE AMPLIFICATION LEVEL OF SIGNALS IN EITHER OF SAID CHANNELS WITH RESPECT
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) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |