US3145265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound reproduction apparatus
Assignee: Individual
•
Filing: 1961-04-10
•
Granted: 1964-08-18
•
Expires: 1981-04-10
Abstract
No abstract record available.
Inventors
- 👤 Tamura Yoshiaki
- 👤 George W Carmichael
- 👤 Panos D Georgantas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:52
CPC Classifications
H; H04; H04S; H04S5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
ACOUSTIC DELAY APPARATUS FOR A SOUND REPRODUCTION SYSTEM, SAID APPARATUS COMPRISING: MEANS DEFINING AN ENCLOSURE; A FIRST LOUDSPEAKER AND A SECOND LOUDSPEAKER MOUNTED IN SAID ENCLOSURE IN CONFRONTING, SPACED RELATIONSHIP, SAID FIRST AND SAID SECOND LOUDSPEAKERS DEFINING WITH SAID ENCLOSURE A FIRST FLUID COLUMN BACK OF SAID FIRST LOUDSPEAKER FOR BACKLOADING SAID FIRST LOUDSPEAKER, A SECOND FLUID COLUMN BACK OF SAID SECOND LOUDSPEAKER FOR BACKLOADING SAID SECOND LOUDSPEAKER, AND A THIRD FLUID COLUMN BETWEEN SAID FIRST AND SAID SECOND LOUDSPEAKER FOR TRANSMITTING ACOUSTICAL VIBRATIONS BETWEEN SAID FIRST AND SAID SECOND LOUDSPEAKERS; MEANS FOR APPLYING AUDIOFREQUENCY ELECTRICAL SIGNALS TO ONE OF SAID FIRST AND SECOND LOUDSPEAKERS; AND MEANS FOR TRANSMITTING AUDIO-FREQUENCY ELECTRICAL SIGNALS FROM THE OTHER OF SAID FIRST AND SAID SECOND LOUDSPEAKERS.
Claim 2
Dependent Claim
122 words
ACOUSTIC DELAY APPARATUS FOR A SOUND REPRODUCTION SYSTEM, SAID APPARATUS COMPRISING: MEANS DEFINING AN ENCLOSURE; A FIRST LOUDSPEAKER AND A SECOND LOUDSPEAKER MOUNTED IN SAID ENCLOSURE IN CONFRONTING, SPACED RELATIONSHIP, SAID FIRST AND SAID SECOND LOUDSPEAKERS DEFINING WITH SAID ENCLOSURE A FIRST FLUID COLUMN BACK OF SAID FIRST LOUDSPEAKER FOR BACKLOADING SAID FIRST LOUDSPEAKER, A SECOND FLUID COLUMN BACK OF SAID SECOND LOUDSPEAKER FOR BACKLOADING SAID SECOND LOUDSPEAKER, AND A THIRD FLUID COLUMN BETWEEN SAID FIRST AND SAID SECOND LOUDSPEAKER FOR TRANSMITTING ACOUSTICAL VIBRATIONS BETWEEN SAID FIRST AND SAID SECOND LOUDSPEAKERS; MEANS FOR APPLYING AUDIOFREQUENCY ELECTRICAL SIGNALS TO ONE OF SAID FIRST AND SECOND LOUDSPEAKERS; AND MEANS FOR TRANSMITTING AUDIO-FREQUENCY ELECTRICAL SIGNALS FROM THE OTHER OF SAID FIRST AND SAID SECOND LOUDSPEAKERS.
References Cited (Backward Citations)
US2832843A
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US2065578A
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US2403232A
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US2419894A
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US2978543A
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US2837597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-18 | 1968-02-17 | 1968-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-18 | 1972-02-17 | 1972-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-18 | 1976-02-17 | 1976-08-18 | $7700.00 | Window Closed / Lapsed |