US3153120A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereophonic sound reproduction system
Assignee: Automatic Canteen Co
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Filing: 1961-06-05
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Granted: 1964-10-13
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Expires: 1981-06-05
Abstract
No abstract record available.
Inventors
- 👤 Brown Charles Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:22
CPC Classifications
H; H04; H04R; H04R5/00; H04R5/02; H04S; H04S3/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
183 words
IN A STEREOPHONIC SOUND SYSTEM INCLUDING FIRST AND SECOND AMPLIFIERS, AN OUTPUT SIGNAL FROM EACH SAID AMPLIFIER; FIRST MEANS FOR DERIVING MAJOR AND MINOR PORTIONS OF THE OUTPUT SIGNAL FROM SAID FIRST AMPLIFIER; SECOND MEANS FOR DERIVING MAJOR AND MINOR PORTIONS OF THE OUTPUT SIGNAL FROM SAID SECOND AMPLIFIER; A SOUND REPRODUCTION APPARATUS COMPRISING A FIRST AND A SECOND LOUD SPEAKER CLOSELY SPACED WITH RESPECT TO ONE ANOTHER WITHIN A HOUSING AND FACING AWAY FROM ONE ANOTHER; CIRCUIT MEANS CONDUCTIVELY CONNECTED TO ENERGIZE SAID FIRST SPEAKER WITH THE MAJOR PORTION OF THE SIGNAL DERIVED FROM SAID FIRST AMPLIFIER IN SERIES AND IN OPPOSED PHASE RELATIONSHIP WITH THE MINOR PORTION OF THE SIGNAL DERIVED FROM SAID SECOND AMPLIFIER, SAID CIRCUIT MEANS FURTHER CONDUCTIVELY CONNECTED TO ENERGIZE SAID SECOND SPEAKER WITH THE MAJOR PORTION OF THE SIGNAL DERIVED FROM SAID SECOND AMPLIFIER IN SERIES AND OPPOSED PHASE RELATIONSHIP WITH THE MINOR PORTION OF THE SIGNAL DERIVED FROM SAID FIRST AMPLIFIER; AND SAID CIRCUIT MEANS FURTHER CONNECTING SAID FIRST AND SAID SECOND LOUD SPEAKERS IN MUTUALLY OPPOSED PHASE RELATION WITH RESPECT TO THE MAJOR SIGNAL PORTIONS.
References Cited (Backward Citations)
US2143175A
Cited
US2610694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-10-13 | 1968-04-13 | 1968-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-13 | 1972-04-13 | 1972-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-13 | 1976-04-13 | 1976-10-13 | $7700.00 | Window Closed / Lapsed |