Patent US5298328A successfully refreshed from Google Patents.
US5298328A
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US
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Packing material and method of making same
Assignee: Coorstek KK
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Filing: 1991-08-12
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Granted: 1994-03-29
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Expires: 2011-08-12
Abstract
Abstract A packing material for sealing electronic devices having improved, higher thermal conductivity than amorphous silica-containing packing material. The packing material comprises a thermosetting resin and a filler particle comprising a core inorganic particle and an amorphous silica coating on the core particle. The core particle is made from material having a thermal conductivity higher than that of amorphous silica, for example, a metal nitride such as aluminum nitride or silicon nitride, or a metal oxide such as aluminum oxide, or crystalline silicon dioxide. The amorphous silica coating may be formed by hydrolysis of alkoxysilane.
Inventors
- 👤 Hajime Abe
- 👤 Tsutomu Nishiwaki
- 👤 Yoji Nagano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:10
CPC Classifications
H; H10; H10W; H10W74/00; H10W74/40; H10W74/47; H10W74/473; H10W72/00; H10W74/43; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2962; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
A packing material comprising: a thermosetting resin; and a filler particle dispersed in the thermosetting resin, the filler particle comprising a core inorganic material consisting essentially of a material selected from the group consisting of crystalline silicon dioxide and silicon nitride, the particle having an average diameter of from about 10 μm to about 50 μm and having a thermal conductivity higher than that of amorphous silica, the core inorganic particle being coated with an amorphous silica coating thereon, the amorphous silica coating having a thickness of from about 0.01% to about 1% of the core inorganic particle diameter.
Claim 2
Dependent Claim
99 words
A packing material comprising: a thermosetting resin; and a filler particle dispersed in the thermosetting resin, the filler particle comprising a core inorganic material consisting essentially of a material selected from the group consisting of crystalline silicon dioxide and silicon nitride, the particle having an average diameter of from about 10 μm to about 50 μm and having a thermal conductivity higher than that of amorphous silica, the core inorganic particle being coated with an amorphous silica coating thereon, the amorphous silica coating having a thickness of from about 0.01% to about 1% of the core inorganic particle diameter.
Claim 3
Dependent Claim
22 words
A packing material according to claim 1, wherein the amorphous silica coating is formed by firing a hydrolyzed product of an alkoxysilane.
Claim 4
Dependent Claim
16 words
A packing material according to claim 1, wherein the core inorganic particle is crystalline silicon dioxide.
Claim 5
Dependent Claim
25 words
A packing material according to claim 3, wherein the average diameter of the core inorganic particle is from about 20 μm to about 40 μm.
Claim 6
Dependent Claim
23 words
A packing material according to claim 4, wherein the amorphous coating has a thickness of from about 0.02 μm to about 0.04 μm.
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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) | 1997-03-28 | 1997-09-27 | 1998-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-28 | 2001-09-27 | 2002-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-28 | 2005-09-27 | 2006-03-29 | $7700.00 | Window Closed / Lapsed |