US5137959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally conductive elastomer containing alumina platelets
Assignee: Parker Intangibles LLC
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Filing: 1991-05-24
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Granted: 1992-08-11
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Expires: 2011-05-24
Abstract
Abstract Alpha alumina platelets are used as thermally conductive, electrically insulating filler in thermally conductive, electrically insulating elastomers. The platelets provide improved thermal conductivity in comparison to conventional alumina fillers. The platelets preferably average less than one micron thickness with an average aspect ratio of at least about 5:1.
Inventors
- 👤 Jacob Block
- 👤 John W. K. Lau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:44
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C01P; C01P2004/00; C01P2004/20; C01P2004/54; C01P2006/00; C01P2006/32; C01P2006/40; C08K2201/00; C08K2201/016
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
34 words
A thermally conductive filled elastomer composition consisting essentially of an elastomer and filler, said filler consisting essentially of alpha alumina platelets having an average ratio of diameter to thickness of at least about 5:1.
Claim 2
Dependent Claim
34 words
A thermally conductive filled elastomer composition consisting essentially of an elastomer and filler, said filler consisting essentially of alpha alumina platelets having an average ratio of diameter to thickness of at least about 5:1.
Claim 3
Dependent Claim
17 words
The composition of claim 1 wherein said platelets have an average thickness of less than one micron.
Claim 4
Dependent Claim
16 words
The composition of claim 2 wherein said platelets have an average diameter of about 2-50 microns.
Claim 5
Dependent Claim
13 words
The composition of claim 1 containing at least about 70 wt.% alumina platelets.
Claim 6
Dependent Claim
11 words
The composition of claim 1 wherein said elastomer includes silicone rubber.
Claim 7
Dependent Claim
11 words
The composition of claim 1 wherein said elastomer includes block copolymer.
Claim 8
Dependent Claim
10 words
The composition of claim 6 wherein said copolymer contains olefin.
Claim 9
Dependent Claim
10 words
The composition of claim 5 wherein said copolymer contains styrene.
Claim 10
Dependent Claim
10 words
The composition of claim 1 wherein said elastomer is crosslinked.
Claim 11
Dependent Claim
16 words
The composition of claim 1 having a thermal conductivity of at least about 2.5×10 -3 cal/sec-cm-K.
Claim 12
Dependent Claim
15 words
The composition of claim 1 wherein said composition is in the form of a sheet.
Claim 13
Dependent Claim
16 words
The composition of claim 10 having a thermal conductivity of at least about 3.0×10 -3 cal/sec-cm-K.
References Cited (Backward Citations)
US5008307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |