Patent US4343376A successfully refreshed from Google Patents.
US4343376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibratory elements for audio equipment
Assignee: Pioneer Corp
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Filing: 1981-03-09
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Granted: 1982-08-10
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Expires: 2001-03-09
Abstract
Abstract Vibratory elements for use in audio equipment are fabricated from a kneaded mixture comprising post-chlorinated polyvinyl chloride and flaky graphite powder. The kneaded mixture is rolled into a sheet in which graphite flakes are oriented parallel to the surface and the sheet is then formed into a desird shape, for example, a dome- or cone-shaped diaphragm and a cantilever, as by vacuum forming, air-pressure forming or press molding. The mixture may further include polymethyl methacrylate and/or rubber-like material. The elements are characterized by improved temperature resistance.
Inventors
- 👤 Tsunehiro Tsukagoshi
- 👤 Shinichi Yokozeki
- 👤 Sumio Hagiwara
- 👤 Masataka Uchidoi
- 👤 Toshikazu Yoshino
- 👤 Yasuyuki Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:09
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L33/12; G; G10; G10K; G10K13/00; C08L27/00; C08L27/22; C08L27/24; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/268
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
30 words
An acoustic vibratory element fabricated from a kneaded mixture comprising post-chlorinated polyvinyl chloride and flaky graphite powder, the graphite flakes being oriented substantially parallel to the surface of the element.
Claim 2
Dependent Claim
30 words
An acoustic vibratory element fabricated from a kneaded mixture comprising post-chlorinated polyvinyl chloride and flaky graphite powder, the graphite flakes being oriented substantially parallel to the surface of the element.
Claim 3
Dependent Claim
16 words
An acoustic vibratory element according to claim 1 wherein the kneaded mixture further contains polymethyl methacrylate.
Claim 4
Dependent Claim
17 words
An acoustic vibratory element according to claim 1 wherein the kneaded mixture further contains a rubber-like material.
Claim 5
Dependent Claim
20 words
An acoustic vibratory element according to claim 1 wherein the kneaded material further contains polymethyl methacrylate and a rubber-like material.
Claim 6
Dependent Claim
28 words
An acoustic vibratory element according to claim 3 or 4 wherein said rubber-like material is selected from the group consisting of acrylonitrile-butadiene rubber, butyl rubber and styrene-butadiene rubber.
Claim 7
Dependent Claim
32 words
An acoustic vibratory element according to claim 1 wherein said kneaded mixture contains 90 to 10% by weight of post-chlorinated polyvinyl chloride and 10 to 90% by weight of flaky graphite powder.
Claim 8
Dependent Claim
32 words
An acoustic vibratory element according to claim 6 wherein said kneaded mixture contains 50 to 25% by weight of post-chlorinated polyvinyl chloride and 50 to 75% by weight of flaky graphite powder.
Claim 9
Dependent Claim
36 words
An acoustic vibratory element according to claim 6 wherein the mixture further contains 1-15% by weight of polymethyl methacrylate and/or 2-50% by weight of a rubber-like material based on the weight of the post-chlorinated polyvinyl chloride.
Claim 10
Dependent Claim
27 words
An acoustic vibratory element according to any one of claims 1 to 8 wherein the graphite flakes have a particle size of 0.1 to about 20 microns.
Claim 11
Dependent Claim
22 words
An acoustic vibratory element according to claim 9 wherein the graphite flakes have a particle size of 0.1 to about 5 microns.
Claim 12
Dependent Claim
40 words
An acoustic vibratory element according to claim 1 wherein the element is fabricated by rolling the kneaded mixture into a sheet and then forming the sheet into a desired shape by way of vacuum forming, air-pressure forming or press molding.
Claim 13
Dependent Claim
19 words
An acoustic vibratory element according to any one of claim 1 to 11 wherein said element is a diaphragm.
Claim 14
Dependent Claim
15 words
An acoustic vibratory element according to claim 12 wherein said element is a cone-shaped diaphragm.
Claim 15
Dependent Claim
15 words
An acoustic vibratory element according to claim 12 wherein said element is a dome-shaped diaphragm.
Claim 16
Dependent Claim
19 words
An acoustic vibratory element according to any one of claims 1 to 11 wherein said element is a cantilever.
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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) | 1985-08-09 | 1986-02-08 | 1986-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-09 | 1990-02-08 | 1990-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-09 | 1994-02-08 | 1994-08-10 | $7700.00 | Window Closed / Lapsed |