US3612783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foam diaphragm for loudspeaker
Assignee: US Philips Corp
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Filing: 1968-07-01
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Granted: 1971-10-12
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Expires: 1988-07-01
Abstract
Abstract An acoustic converter formed as a foam membrane with its neck, cone, centering ring, and peripheral zone sectors made of different foam constituents with different mechanical and acoustical properties.
Inventors
- 👤 Kuno Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:42
CPC Classifications
H; H04; H04R; H04R31/00; H04R31/003; B; B29; B29C; B29C45/00; B29C45/16; B29C45/1635; H04R7/00; H04R7/02; H04R7/12; H04R7/122; B29L; B29L2031/00; B29L2031/34; B29L2031/3418
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
64 words
An acoustic converter comprising a plurality of sectors such as the neck, the cone, peripheral zone, and supporting part, the different sectors composed selectively of different foam constituents with different acoustic and mechanical properties, the interface between at least one pair of adjacent sectors of different foams being a generally continuous transition with said pair of different foams being partially mixed at said interface.
Claim 2
Dependent Claim
64 words
An acoustic converter comprising a plurality of sectors such as the neck, the cone, peripheral zone, and supporting part, the different sectors composed selectively of different foam constituents with different acoustic and mechanical properties, the interface between at least one pair of adjacent sectors of different foams being a generally continuous transition with said pair of different foams being partially mixed at said interface.
Claim 3
Dependent Claim
34 words
An acoustic converter according to claim 1 and operative with speaker parts such s a moving coil and a centering ring, wherein at least one of said parts is directly embedded in the foam.
Claim 4
Dependent Claim
30 words
A device according to claim 1 wherein the foam is a reaction product of di- or tri-isocyanates and polyhydroxyl compounds, with selected ratios of these compounds in said different sectors.
Claim 5
Dependent Claim
34 words
A device according to claim 1 further comprising a centering ring sector, and wherein the neck and cone sectors are relatively rigid, and the centering ring, peripheral zone, and supporting part are relatively elastic.
Claim 6
Dependent Claim
23 words
A device according to claim 1 wherein the foams of the different sectors varies in regard to the size and density of pores.
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) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |