US3143183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct radiator high fidelity loudspeaker
Assignee: Individual
•
Filing: 1963-02-25
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Granted: 1964-08-04
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Expires: 1983-02-25
Abstract
No abstract record available.
Inventors
- 👤 Herbstman Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:10
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/04; H04R9/00; H04R9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A WOOFER LOUDSPEAKER SECTION HAVING A FAIRLY EVEN SOUND PRESSURE LEVEL WELL ABOVE TRANSIENT DISTORTION AT FREQUENCIES BETWEEN ABOUT 20 C.P.S. AND 3000 C.P.S., COMPRISING IN COMBINATION, AN OUTER FRAME DEFINING A PLANE; A FLAT, LARGE AREA SQUARE-SHAPED POLYSTYRENE RADIATOR DIAPHRAGM HAVING A CENTRAL APERTURE THEREIN SO THAT A VOICE COIL CAN BE COUPLED THERETO; INNER AND OUTER EDGE PORTIONS ON SAID DIAPHRAGM, SAID OUTER EDGE PORTION BEING RIGIDLY FIXED TO SAID OUTER FRAME, SAID INNER AND OUTER PORTIONS BEING COUPLED BY FLEXIBLE SUSPENSION MEANS; AND, A STEEL WIRE RING OF HIGH DENSITY MATERIAL BETWEEN SAID CENTRAL APERTURE AND SAID INNER EDGE PORTION.
Claim 2
Dependent Claim
103 words
A WOOFER LOUDSPEAKER SECTION HAVING A FAIRLY EVEN SOUND PRESSURE LEVEL WELL ABOVE TRANSIENT DISTORTION AT FREQUENCIES BETWEEN ABOUT 20 C.P.S. AND 3000 C.P.S., COMPRISING IN COMBINATION, AN OUTER FRAME DEFINING A PLANE; A FLAT, LARGE AREA SQUARE-SHAPED POLYSTYRENE RADIATOR DIAPHRAGM HAVING A CENTRAL APERTURE THEREIN SO THAT A VOICE COIL CAN BE COUPLED THERETO; INNER AND OUTER EDGE PORTIONS ON SAID DIAPHRAGM, SAID OUTER EDGE PORTION BEING RIGIDLY FIXED TO SAID OUTER FRAME, SAID INNER AND OUTER PORTIONS BEING COUPLED BY FLEXIBLE SUSPENSION MEANS; AND, A STEEL WIRE RING OF HIGH DENSITY MATERIAL BETWEEN SAID CENTRAL APERTURE AND SAID INNER EDGE PORTION.
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) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |