Patent US5108833A successfully refreshed from Google Patents.
US5108833A
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US
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Porous structural unit and a method of preparing the same
Assignee: Mitsubishi Electric Home Appliance Co Ltd
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Filing: 1989-10-31
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Granted: 1992-04-28
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Expires: 2009-10-31
Abstract
Abstract The present invention concerns a method of preparing a porous structural unit comprising a plurality of layers having different specific gravities by pressing and heating a material including resin particles between opposing molds having a temperature difference to thereby cause the fusion or bonding of the resin particles, and a porous structural unit which improves acoustic absorption properties and heat insulation properties and in which the specific gravity is continuously changed.
Inventors
- 👤 Yoshihiro Noguchi
- 👤 Toshihisa Imai
- 👤 Yutaka Takahashi
- 👤 Hideharu Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:38
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/20; G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; B29C43/00; B29C43/003; B29C43/02; B29C43/20; B29C43/203; B29C44/00; B29C44/02; B29C44/04; B29C44/0407; B29C44/10; B29C44/34; B29C44/36; B29C44/38; B29C44/44; B29C44/445; B29C67/205; B29K; B29K2105/00; B29K2105/04; B29K2105/06; B29K2105/16; B29K2705/00; B29K2705/08; B29K2705/12; B29K2995/00; B29K2995/0037; B29K2995/0065; B29K2995/0067; B29K2995/0068; B29K2995/0069; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249961; Y10T428/249986; Y10T428/249987; Y10T428/249991; Y10T428/249992
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
75 words
A sound absorbing porous structural unit having a porous layer in which the specific gravity is continuously changed in the direction of the thickness of said layer, wherein one side surface of said porous layer is attached with a solid layer having a porosity lower than that of said porous layer, and the other side surface of said porous layer is mold shaped with a skin layer having a thickness of 100 μm or less.
Claim 2
Dependent Claim
75 words
A sound absorbing porous structural unit having a porous layer in which the specific gravity is continuously changed in the direction of the thickness of said layer, wherein one side surface of said porous layer is attached with a solid layer having a porosity lower than that of said porous layer, and the other side surface of said porous layer is mold shaped with a skin layer having a thickness of 100 μm or less.
Claim 3
Dependent Claim
20 words
The porous structural unit according to claim 1, wherein a granular material constituting the porous layer is spherical or elliptical.
Claim 4
Dependent Claim
26 words
The porous structural unit according to claim 2, wherein the length of the major axis of the granular material is in a range of 0.2-3.0 mm.
Claim 5
Dependent Claim
23 words
The porous structural unit according to claim 1, wherein said solid layer is a fusion layer and is fuse-bonded to said porous layer.
Claim 6
Dependent Claim
14 words
The porous structural unit according to claim 4, wherein said fusion layer is non-air-permeable.
Claim 7
Dependent Claim
21 words
The porous structural unit according to claim 1, wherein a plurality of the porous layers and the solid layers are combined.
Claim 8
Dependent Claim
23 words
The porous structural unit according to claim 1, wherein different shapes or materials are used for a granular material constituting said porous layer.
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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) | 1995-04-28 | 1995-10-28 | 1996-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-28 | 1999-10-28 | 2000-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-28 | 2003-10-28 | 2004-04-28 | $7700.00 | Window Closed / Lapsed |