US3308904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Kelly loudspeakers
Assignee: —
•
Filing: —
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Granted: 1967-03-14
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Expires: 1984-03-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:42
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/16; H04R7/18; H04R7/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A LOUDSPEAKER COMPRISING A FIXED SUPPORT, AN ELECTRO-MECHANICAL TRANSDUCER MOUNTED IN SAID SUPPORT, A RIGID CIRCULAR PISTON DRIVEN BY SAID TRANSDUCER WHEREBY THE PISTON IS MOVED WITH RESPECT TO THE SUPPORT IN ACCORDANCE WITH APPLIED ELECTRICAL SIGNALS, A RIGID ANNULUS SURROUNDING THE PISTON AND CONCENTRIC THEREWITH, AND A SHEET OF FLEXIBLE MATERIAL SECURED TO THE PISTON AND TO SAID FIXED SUPPORT, WHICH SHEET EXTENDS OUTWARDLY IN A RADIAL PLANE FROM THE PISTON, SAID ANNULUS BEING SECURED ON SAID SHEET OF FLEXIBLE MATERIAL WHEREBY THE FLEXIBLE MATERIAL FORMS A COMPLIANT COUPLING BETWEEN THE PISTON AND THE ANNULUS AND BETWEEN THE ANNULUS AND THE SUPPORT, THE FLEXIBLE MATERIAL AND ANNULUS TOGETHER FORMING AN AIR SEAL BETWEEN THE PISTON AND THE SUPPORT, THE ANNULUS HAVING A MASS AND EFFECTIVE AREA EQUAL RESPECTIVELY TO THE MASS AND EFFECTIVE AREA OF THE PISTON, AND THE SPACING BETWEEN THE PISTON AND ANNULUS AND BETWEEN THE ANNULUS AND SUPPORT BEING SO PROPORTIONED THAT THE COMPLIANCE BETWEEN THE PISTON AND ANNULUS IS EQUAL TO THE COMPLIANCE BETWEEN THE ANNULUS AND THE SUPPORT.
Claim 2
Dependent Claim
174 words
A LOUDSPEAKER COMPRISING A FIXED SUPPORT, AN ELECTRO-MECHANICAL TRANSDUCER MOUNTED IN SAID SUPPORT, A RIGID CIRCULAR PISTON DRIVEN BY SAID TRANSDUCER WHEREBY THE PISTON IS MOVED WITH RESPECT TO THE SUPPORT IN ACCORDANCE WITH APPLIED ELECTRICAL SIGNALS, A RIGID ANNULUS SURROUNDING THE PISTON AND CONCENTRIC THEREWITH, AND A SHEET OF FLEXIBLE MATERIAL SECURED TO THE PISTON AND TO SAID FIXED SUPPORT, WHICH SHEET EXTENDS OUTWARDLY IN A RADIAL PLANE FROM THE PISTON, SAID ANNULUS BEING SECURED ON SAID SHEET OF FLEXIBLE MATERIAL WHEREBY THE FLEXIBLE MATERIAL FORMS A COMPLIANT COUPLING BETWEEN THE PISTON AND THE ANNULUS AND BETWEEN THE ANNULUS AND THE SUPPORT, THE FLEXIBLE MATERIAL AND ANNULUS TOGETHER FORMING AN AIR SEAL BETWEEN THE PISTON AND THE SUPPORT, THE ANNULUS HAVING A MASS AND EFFECTIVE AREA EQUAL RESPECTIVELY TO THE MASS AND EFFECTIVE AREA OF THE PISTON, AND THE SPACING BETWEEN THE PISTON AND ANNULUS AND BETWEEN THE ANNULUS AND SUPPORT BEING SO PROPORTIONED THAT THE COMPLIANCE BETWEEN THE PISTON AND ANNULUS IS EQUAL TO THE COMPLIANCE BETWEEN THE ANNULUS AND THE SUPPORT.
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) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |