US3858680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration diaphragm and cfne edge of a loudspeaker
Assignee: Panasonic Holdings Corp
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Filing: 1974-03-12
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Granted: 1975-01-07
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Expires: 1994-03-12
Abstract
Abstract Herein disclosed are an improved vibration diaphragm and an improved cone edge of a loudspeaker, wherein the vibration diaphragm is formed of a foamed plastics which is formed with portions having a density or densities lower than the remaining portion of the diaphragm and/or which has at least one coating of resin applied to at least one surface of the foamed plastics in the form of an aqueous emulsion and wherein the cone edge is formed of a foamed plastics having a closed-cellular structure. The vibration diaphragm and cone edge, which may preferably be used in combination with each other, will contribute to improving the acoustic characteristics of the loudspeaker to a considerable extent.
Inventors
- 👤 Yasuhiko Tsuge
- 👤 Noboru Koizumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:54
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/12; H04R7/122; H04R7/125; H04R31/00; H04R31/003; H04R7/16; H04R7/18; H04R7/20; H04R2307/00; H04R2307/029
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
25 words
AN ANNULAR CONE EDGE OF A LOUDSPEAKER, WHICH CONE EDGE IS FORMED OF A FOAMED COPOLYMER OF ETHYLENE AND VINYL ACETATE, HAVING A CLOSED-CELLULAR STRUCTURE.
Claim 2
Dependent Claim
25 words
AN ANNULAR CONE EDGE OF A LOUDSPEAKER, WHICH CONE EDGE IS FORMED OF A FOAMED COPOLYMER OF ETHYLENE AND VINYL ACETATE, HAVING A CLOSED-CELLULAR STRUCTURE.
Claim 3
Dependent Claim
32 words
An annular cone edge as claimed in claim 1, in which said copolymer contains 65 to 90 percent by weight of ethylene and 35 to 10 percent by weight of vinyl acetate.
Claim 4
Dependent Claim
29 words
An annular cone edge as claimed in claim 1, in which poLyethylene is mixed with said copolymer in a quantity less than the quantity of said copolymer by weight.
Claim 5
Dependent Claim
29 words
An annular cone edge as claimed in claim 2, in which polyethylene is mixed with said copolymer in a quantity less than the quantity of said copolymer by weight.
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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |