Patent US4847981A successfully refreshed from Google Patents.
US4847981A
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Method for producing a diaphragm for acoustic appliances
Assignee: Yamaha Corp
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Filing: 1988-04-21
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Granted: 1989-07-18
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Expires: 2008-04-21
Abstract
Abstract In production of a diaphragm for acoustic appliances, a thin metal layer is formed on a substrate by means of vapor phase development so that the density of the product should be high enough for generating high sound pressure even in the high frequency range.
Inventors
- 👤 Kunio Suzuki
- 👤 Toshiharu Hoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:01
CPC Classifications
H; H04; H04R; H04R31/00; H04R31/003; H04R7/00; H04R7/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49005; Y10T29/4998; Y10T29/49982
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
49 words
An improved method for producing a diaphragm for acoustic appliances comprising the steps of developing a thin metal layer on a substrate by means of vapor phase development, and increasing the density of said thin metal layer by exposing said layer to an elevated temperature and an elevated pressure.
Claim 2
Dependent Claim
49 words
An improved method for producing a diaphragm for acoustic appliances comprising the steps of developing a thin metal layer on a substrate by means of vapor phase development, and increasing the density of said thin metal layer by exposing said layer to an elevated temperature and an elevated pressure.
Claim 3
Dependent Claim
27 words
An improved method as claimed in claim 1 wherein said increasing of the density of said thin metal layer is carried out on a hot press device.
Claim 4
Dependent Claim
27 words
An improved method as claimed in claim 1 wherein said increasing of the density of said thin metal layer is carried out on a hot hydrostatic device.
Claim 5
Dependent Claim
31 words
An improved method as claimed in claim 1 in which a material for said thin metal layer is chosen from a group consisting of beryllium, beryllium alloys, titanium and titanium alloys.
Claim 6
Dependent Claim
34 words
An improved method as claimed in claim 1 wherein said elevated temperature is between about 0.35 Tm and about Tm, Tm being the melting point of a material used for said thin metal layer.
Claim 7
Dependent Claim
18 words
An improved method as claimed in claim 1 wherein said elevated pressure is at least about 20 MPa.
Claim 8
Dependent Claim
13 words
A diaphragm for acoustic appliances produced by the method according to claim 1.
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) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |