US4128138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm for speaker
Assignee: Sanyo Electric Co Ltd
•
Filing: 1976-12-20
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Granted: 1978-12-05
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Expires: 1996-12-20
Abstract
Abstract A diaphragm for a dynamic cone speaker which is composed of a porous metal produced from nickel powder wherein a vinyl chloride sheet is disposed on the surface of the porous metal to eliminate the gas permeability of the porous metal.
Inventors
- 👤 Yasuhiro Ishii
- 👤 Shintaro Hirose
- 👤 Ryoichi Kawasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:35
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/12; H04R31/00; H04R31/003; H04R7/122; H04R7/125; H04R2307/00; H04R2307/027; Y; Y10; Y10T; Y10T428/00; Y10T428/21; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/249982; Y10T428/249987; Y10T428/24999; Y10T428/249991; Y10T428/249992; Y10T428/25; Y10T428/256
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
61 words
A diaphragm for a speaker comprising: a sheet for porous metal material formed from sintered metal powder and shaped in the form of the diaphragm, the pores of the metal material being void of solid material, and a sheet of material substantially impermeable to air attached to and covering the active surface area of at least one surface of the diaphragm.
Claim 2
Dependent Claim
61 words
A diaphragm for a speaker comprising: a sheet for porous metal material formed from sintered metal powder and shaped in the form of the diaphragm, the pores of the metal material being void of solid material, and a sheet of material substantially impermeable to air attached to and covering the active surface area of at least one surface of the diaphragm.
Claim 3
Dependent Claim
21 words
A diaphragm for a speaker as described in claim 1 wherein said impermeable material comprises a sheet of synthetic resin material.
Claim 4
Dependent Claim
20 words
A diaphragm for a speaker as described in claim 1 wherein said impermeable material comprises a sheet of metal foil.
Claim 5
Dependent Claim
21 words
A diaphragm for a speaker as described in claim 1 wherein said impermeable material comprises a metal membrane in sheet form.
Claim 6
Dependent Claim
30 words
A diaphragm for a speaker as described in claim 1 wherein said sheet of impermeable material is attached by a bonding agent on the surface of the porous metal diaphragm.
Claim 7
Dependent Claim
23 words
A diaphragm for a speaker as described in claim 2, wherein said sheet of synthetic resin material is of a vinyl chloride composition.
Claim 8
Dependent Claim
34 words
A diaphragm for a speaker as described in claim 1 wherein said metal powder of the porous metal material for the diaphragm is selected from the group consisting of nickel, aluminum, titanium and beryllium.
Claim 9
Dependent Claim
35 words
A diaphragm for a speaker as described in claim 1 wherein the area density of said porous metal material of the diaphragm is in the range of from about 0.02 to about 0.06g/cm 2 .
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |