US3124649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: —
•
Filing: —
•
Granted: 1964-03-10
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Expires: 1981-03-10
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:03
CPC Classifications
H; H04; H04S; H04S1/00; H04S1/002; H04S1/005
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
72 words
A METHOD OF AUDIO REPRODUCTION COMPRISING: PRODUCTING A PAIR OF AUDIO INPUT SIGNALS, SUBTRACTING A PORTION FROM EACH OF SAID PAIR OF INPUT SIGNALS, SEPARATING A MID-BAND RANGE OF FREQUENCIES FROM EACH OF THE SUBTRACTED PORTIONS OF SAID PAIR OF INPUT SIGNALS, MIXING SAID SUBTRACTED PORTIONS TO FORM A MIXTURE OF MID-BAND FREQUENCIES, REVERSING THE PHASE OF ONE PORTION OF SAID MIXTURE WITHOUT CHANGING THE PHASE OF ANOTHER PORTION OF SAID MIXTURE,
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) | 1967-03-10 | 1967-09-09 | 1968-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-10 | 1971-09-09 | 1972-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-10 | 1975-09-09 | 1976-03-10 | $7700.00 | Window Closed / Lapsed |