US3164676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereophonic system employing audio matrixing
Assignee: Lanteris Space LLC
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Filing: 1961-03-13
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Granted: 1965-01-05
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Expires: 1981-03-13
Abstract
No abstract record available.
Inventors
- 👤 David H Brunner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:36
CPC Classifications
H; H04; H04S; H04S5/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
111 words
A STEREOPHONIC SIGNAL REPRODUCING SYSTEM COMPRISING INPUT MEANS FOR PROVIDING AT FIRST AND SECOND OUTPUTS ELECTRICAL SIGNALS REPRESENTATIVE OF THE INSTANTANEOUS SUM AND THE INSTANTANEOUS DIFFERENCE, RESPECTIVELY, OF TWO STEREOPHONICALLY RELATED PROGRAM SIGNALS, A FIRST ELECTROACOUSTIC WAVE TRANSDUCER ARRANGED TO DIRECT ACOUSTIC WAVE ENERGY IN A SELECTED PATH, MEANS COUPLING SAID FIRST OUTPUT TO SAID FIRST ELECTRO-ACOUSTIC WAVE TRANSDUCER, SAID FIRST TRANSDUCER PRODUCING AN ACOUSTIC WAVE REPRESENTATIVE OF SAID INSTANTANEOUS SUM OF SAID TWO STEREOPHONICALLY RELATED PROGRAM SIGNALS IN RESPONSE TO SIGNALS SUPPLIED AT SAID FIRST OUTPUT, ADDITIONAL ELECTRO-ACOUSTIC WAVE TRANSDUCER MEANS, ADDITIONAL MEANS COUPLING SAID SECOND OUTPUT TO SAID ADDITIONAL ELECTRO-ACOUSTIC WAVE TRANSDUCER MEANS, SAID ADDITIONAL TRANSDUCER MEANS PRODUCING IN
References Cited (Backward Citations)
US3104729A
Cited
US3076873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-01-05 | 1968-07-06 | 1969-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-01-05 | 1972-07-06 | 1973-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-01-05 | 1976-07-06 | 1977-01-05 | $7700.00 | Window Closed / Lapsed |