Patent US3645176A successfully refreshed from Google Patents.
Patent US6013362A successfully refreshed from Google Patents.
US6013362A
Expired / Lapsed
US
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Soundproof material
Assignee: Nitto Denko Corp
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Filing: 1998-02-12
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Granted: 2000-01-11
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Expires: 2018-02-12
Abstract
Abstract A soundproof material comprising a porous member having an air permeation amount based on the pressure difference of 2.039×1/10 4 mmH 2 O of from 1×1/10 10 to 2×1/10 2 cc/cm 2 /second, and having a compressibility.
Inventors
- 👤 Nobuyuki Takahashi
- 👤 Manabu Matsunaga
- 👤 Kazumasa Tanaka
- 👤 Yasunori Sugihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:32
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/36; F16F1/3605; F16F1/37; G; G11; G11B; G11B33/00; G11B33/02; G11B33/08; Y; Y10; Y10S; Y10S360/00; Y10S360/90; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
93 words
A hard disc drive comprising: a hard disc drive body, a substrate, and a soundproof material comprising a compressible porous member which comprises a foam wherein: (1) an air permeation amount based on the pressure difference of 2.039×1/10 4 mmH 2 O is from 1×1/10 10 to 2×1/10 2 cc/cm 2 /second, (2) at least 30% of cells of the foam have an open cell structure; (3) the foam has a foaming ratio of 3 to 20 times; and (4) the foam contains EPDM, interposed between the hard disc body and the substrate.
Claim 2
Dependent Claim
93 words
A hard disc drive comprising: a hard disc drive body, a substrate, and a soundproof material comprising a compressible porous member which comprises a foam wherein: (1) an air permeation amount based on the pressure difference of 2.039×1/10 4 mmH 2 O is from 1×1/10 10 to 2×1/10 2 cc/cm 2 /second, (2) at least 30% of cells of the foam have an open cell structure; (3) the foam has a foaming ratio of 3 to 20 times; and (4) the foam contains EPDM, interposed between the hard disc body and the substrate.
Claim 3
Dependent Claim
27 words
A hard disc drive as claimed in claim 1, wherein the soundproof material has an acoustic absorptivity at a frequency of 3.15 kHz of at least 20%.
Claim 4
Dependent Claim
27 words
A hard disc drive as claimed in claim 1, wherein the soundproof material has a repulsion stress at 50% compression of 10 to 200 gf/cm 2 .
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) | 2003-01-10 | 2003-07-12 | 2004-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-01-10 | 2007-07-12 | 2008-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-01-10 | 2011-07-12 | 2012-01-11 | $7700.00 | Window Closed / Lapsed |