Patent US4428996A successfully refreshed from Google Patents.
US4428996A
Expired / Lapsed
US
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Diaphragm for speaker
Assignee: Sanyo Electric Co Ltd
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Filing: 1981-06-24
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Granted: 1984-01-31
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Expires: 2001-06-24
Abstract
Abstract A diaphragm for a speaker formed of a mixture of carbon fiber, pulp and polyvinyl alcohol fiber as a binder with a thermosetting resin on the diaphragm base on which a metal film is provided in the interstices between fibers and on the entire fiber surface.
Inventors
- 👤 Yasushi Miyoshi
- 👤 Yasuhiro Ishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:47
CPC Classifications
H; H04; H04R; H04R31/00; H04R31/003; D; D21; D21J; D21J3/00; D21J3/12; G; G10; G10K; G10K13/00; H04R7/00; H04R7/02; H04R7/12; H04R2231/00; H04R2231/001; H04R2307/00; H04R2307/021; H04R2307/025; H04R2307/029; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24826; Y10T428/24893; Y10T428/24917; Y10T428/25; Y10T428/253; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2933; Y10T428/294; Y10T428/2964; Y10T428/2965; Y10T428/30; Y10T428/31504; Y10T428/31678; Y10T442/00; Y10T442/60; Y10T442/654; Y10T442/655; Y10T442/69; Y10T442/692; Y10T442/697; Y10T442/699
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
45 words
A speaker diaphragm comprising: a base formed of fibers of pulp and of carbon fibers, said carbon fibers comprising at least 50% by weight of the base, and a layer of electroless plated metal on said base which binds the fibers together at their intersections.
Claim 2
Dependent Claim
45 words
A speaker diaphragm comprising: a base formed of fibers of pulp and of carbon fibers, said carbon fibers comprising at least 50% by weight of the base, and a layer of electroless plated metal on said base which binds the fibers together at their intersections.
Claim 3
Dependent Claim
21 words
A diaphragm as in claim 1 wherein the base also contains fibers of a material for binding with the other fibers.
Claim 4
Dependent Claim
18 words
A diaphragm as in claim 1 further comprising a material filling the interstices between said metal plated fibers.
Claim 5
Dependent Claim
45 words
A diaphragm as in claim 1 wherein the carbon fiber comprises in the range of from about 50% to about 90% by weight of the base and the pulp is in the range of from about 50% to about 10% by weight of the base.
Claim 6
Dependent Claim
38 words
A diaphragm as in either of claim 4 wherein the base also contains fibers of a material for binding with the other fibers in the range of from about 5% to about 35% by weight of the base.
Claim 7
Dependent Claim
33 words
A diaphragm as in claim 1 wherein the base also contains in the range of from about 10% to about 35% weight of fibers of a material for binding with the carbon fibers.
Claim 8
Dependent Claim
17 words
A diaphragm as in claim 6 wherein the fibers of the binding material comprise polyvinyl alcohol fibers.
Claim 9
Dependent Claim
49 words
A speaker diaphragm comprising: a base formed of carbon fibers which comprises at least 50% by weight of the base; a layer of electroless plated metal on said base which binds the fibers together at their intersection; and a material filling the interstices between the said metal plated fibers.
Claim 10
Dependent Claim
49 words
A speaker diaphragm comprising: a base formed of carbon fibers which comprises at least 50% by weight of the base; a layer of electroless plated metal on said base which binds the fibers together at their intersection; and a material filling the interstices between the said metal plated fibers.
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) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |