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US4366205A
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Tone-arm elements
Assignee: Pioneer Corp
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Filing: 1981-03-18
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Granted: 1982-12-28
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Expires: 2001-03-18
Abstract
Abstract Elements for a tone-arm system such as arm pipes, head shells, cartridge bodies, and arm bases are fabricated from a kneaded mixture comprising polypropylene and flaky graphite powder. The mixture may further include polymethyl methacrylate and/or rubber-like material. Graphite flakes are preferably oriented parallel to the surface of the element. The elements show 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
2026-10-30 21:41
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/02; G11B3/10; G11B3/30; G11B3/31; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/268; Y10T428/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
16 words
A tone-arm element fabricated from a kneaded mixture comprising polypropylene, polymethyl methacrylate and flaky graphite powder.
Claim 2
Dependent Claim
16 words
A tone-arm element fabricated from a kneaded mixture comprising polypropylene, polymethyl methacrylate and flaky graphite powder.
Claim 3
Dependent Claim
16 words
The tone-arm element according to claim 1 wherein the kneaded mixture further contains a rubber-like material.
Claim 4
Dependent Claim
25 words
The tone-arm element according to claim 2 wherein said rubber-like material is selected from the group consisting of acrylonitrile-butadiene rubber, butyl rubber and styrene-butadiene rubber.
Claim 5
Dependent Claim
30 words
The tone-arm element according to any one of claims 1, 2 or 3 wherein the graphite flakes of said powder are oriented substantially parallel to the surface of the element.
Claim 6
Dependent Claim
51 words
A tone-arm element according to claim 1 wherein said kneaded mixture contains 90 to 10% by weight of polypropylene and 10 to 90% by weight of flaky graphite powder and based on the weight of the polypropylene 1-30% by weight of polymethyl methacrylate and 2-50% by weight of a rubber-like material.
Claim 7
Dependent Claim
29 words
The tone-arm element according to claim 5 wherein said kneaded mixture contains 50 to 25% by weight of polypropylene and 50 to 75% by weight of flaky graphite powder.
Claim 8
Dependent Claim
21 words
The tone-arm element according to claim 5 wherein the graphite flakes have a particle size of 0.1 to about 20 microns.
Claim 9
Dependent Claim
21 words
The tone-arm element according to claim 7 wherein the graphite flakes have a particle size of 0.1 to about 5 microns.
Claim 10
Dependent Claim
25 words
The tone-arm element according to claim 1 wherein the element is fabricated directly from the kneaded mixture by compression molding, injection molding or press molding.
Claim 11
Dependent Claim
39 words
The tone-arm 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.
References Cited (Backward Citations)
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Cited
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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) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |