US3923309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cartridge shell for phonograph pickup
Assignee: Sony Corp
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Filing: 1974-07-17
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Granted: 1975-12-02
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Expires: 1994-07-17
Abstract
Abstract A cartridge shell for a phonograph pickup consisting of an integral cartridge mounting portion and a tone-arm mounting portion, the shell being formed of carbonaceous fibers bonded together by means of a resin.
Inventors
- 👤 Heitaro Nakajima
- 👤 Hirotake Kawakami
- 👤 Shokichi Tatara
- 👤 Jun Kishigami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:48
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/02; G11B3/10; G11B3/44; G11B3/50
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
71 words
A cartridge shell for use with a phonograph, said cartridge shell being mounted on one end of a tone arm and said shell supporting a phonograph cartridge, said shell being composed of carbon fibers bonded together by means of a synthetic resin, said shell possesses a high internal loss so that said shell effectively damps vibrations, is light in weight to provide quick response, and reduces resonance phenomena with high rigidity.
Claim 2
Dependent Claim
71 words
A cartridge shell for use with a phonograph, said cartridge shell being mounted on one end of a tone arm and said shell supporting a phonograph cartridge, said shell being composed of carbon fibers bonded together by means of a synthetic resin, said shell possesses a high internal loss so that said shell effectively damps vibrations, is light in weight to provide quick response, and reduces resonance phenomena with high rigidity.
Claim 3
Dependent Claim
14 words
The cartridge shell of claim 1 in which said resin is a thermosetting resin.
Claim 4
Dependent Claim
30 words
The cartridge shell of claim 1 in which said shell has a cartridge mounting portion and a tone-arm mounting portion disposed at an angle of substantially 90* to each other.
Claim 5
Dependent Claim
19 words
The cartridge shell of claim 3 in which said tone-arm mounting portion is thicker than said cartridge mounting portion.
Claim 6
Dependent Claim
26 words
The cartridge shell of claim 1 in which said cartridge shell is composed of a laminate of sheets containing carbon fibers bonded by a thermosetting resin.
Claim 7
Dependent Claim
12 words
The cartridge shell of claim 1 wherein said carbon fibers are aligned.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |