Patent US3176072A successfully refreshed from Google Patents.
US3176072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereophonic reproduction system
Assignee: MUTER CO
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Filing: 1960-04-21
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Granted: 1965-03-30
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Expires: 1980-04-21
Abstract
No abstract record available.
Inventors
- 👤 James F Novak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:01
CPC Classifications
H; H04; H04S; H04S5/00; H04S1/00; H04S1/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
216 words
A SYSTEM FOR THE REPRODUCTION OF STEREOPHONIC SOUND FROM MODULATED ELECTRICAL SIGNAL CURRENTS CARRIED BY TWO SEPARATE CHANNELS WHICH COMPRISES AN IMPEDANCE BRIDGE HAVING FOUR SERIES-CONNECTED IMPEDANCE ARMS, THE PRODUCT OF THE IMPEDANCES OF ONE PAIR OF OPPOSITE ARMS BEING SUBSTANTIALLY EQUAL TO THE PRODUCT OF THE IMPEDANCES OF THE OTHER PAIR OF OPPOSITE ARMS, A FIRST SOUND REPRODUCING MEANS CONNECTED TO A FIRST PAIR OF POINTS IN SAID BRIDGE, SAID FIRST PAIR OF POINTS HAVING MEANS FOR CONNECTION TO THE FIRST OF SAID CHANNELS, A SECOND SOUND REPRODUCING MEANS CONNECTED TO A SECOND PAIR OF POINTS IN SAID BRIDGE, SAID SECOND PAIR OF POINTS HAVING MEANS FOR CONNECTION TO SAID SECOND CHANNEL, SAID FIRST PAIR OF POINTS BEING AT EQUAL POTENTIAL WITH RESPECT TO THE SIGNAL VOLTAGE APPLIED TO SAID SECOND PAIR OF POINTS AND SAID SECOND PAIR OF POINTS BEING AT EQUAL POTENTIAL WITH RESPECT TO THE SIGNAL VOLTAGE APPLIED TO SAID FIRST PAIR OF POINTS, AND A THIRD SOUND REPRODUCING MEANS HAVING ITS INPUT CIRCUIT CONNECTED TO SAID BRIDGE TO FORM ONE OF SAID IMPEDANCE ARMS IN WHICH THE CURRENTS FROM BOTH SAID CHANNELS ARE ADDITIVE, WHEREBY PORTIONS OF BOTH SIGNAL CURRENTS ARE COMBINED AND INTRODUCED INTO SAID THIRD SOUND REPRODUCING MEANS WHILE SAID CHANNELS ARE MAINTAINED SUBSTANTIALLY ELECTRICALLY ISOLATED FROM EACH OTHR.
Claim 2
Independent Claim
216 words
A SYSTEM FOR THE REPRODUCTION OF STEREOPHONIC SOUND FROM MODULATED ELECTRICAL SIGNAL CURRENTS CARRIED BY TWO SEPARATE CHANNELS WHICH COMPRISES AN IMPEDANCE BRIDGE HAVING FOUR SERIES-CONNECTED IMPEDANCE ARMS, THE PRODUCT OF THE IMPEDANCES OF ONE PAIR OF OPPOSITE ARMS BEING SUBSTANTIALLY EQUAL TO THE PRODUCT OF THE IMPEDANCES OF THE OTHER PAIR OF OPPOSITE ARMS, A FIRST SOUND REPRODUCING MEANS CONNECTED TO A FIRST PAIR OF POINTS IN SAID BRIDGE, SAID FIRST PAIR OF POINTS HAVING MEANS FOR CONNECTION TO THE FIRST OF SAID CHANNELS, A SECOND SOUND REPRODUCING MEANS CONNECTED TO A SECOND PAIR OF POINTS IN SAID BRIDGE, SAID SECOND PAIR OF POINTS HAVING MEANS FOR CONNECTION TO SAID SECOND CHANNEL, SAID FIRST PAIR OF POINTS BEING AT EQUAL POTENTIAL WITH RESPECT TO THE SIGNAL VOLTAGE APPLIED TO SAID SECOND PAIR OF POINTS AND SAID SECOND PAIR OF POINTS BEING AT EQUAL POTENTIAL WITH RESPECT TO THE SIGNAL VOLTAGE APPLIED TO SAID FIRST PAIR OF POINTS, AND A THIRD SOUND REPRODUCING MEANS HAVING ITS INPUT CIRCUIT CONNECTED TO SAID BRIDGE TO FORM ONE OF SAID IMPEDANCE ARMS IN WHICH THE CURRENTS FROM BOTH SAID CHANNELS ARE ADDITIVE, WHEREBY PORTIONS OF BOTH SIGNAL CURRENTS ARE COMBINED AND INTRODUCED INTO SAID THIRD SOUND REPRODUCING MEANS WHILE SAID CHANNELS ARE MAINTAINED SUBSTANTIALLY ELECTRICALLY ISOLATED FROM EACH OTHR.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |