US5011872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally conductive ceramic/polymer composites
Assignee: IMPERIAL BANK
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Filing: 1989-03-22
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Granted: 1991-04-30
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Expires: 2009-03-22
Abstract
Abstract A thermal conductive polymer composition comprising a mixture of a polymer and a thermally conductive filler material, said filler material having a median particle size of between about 130 to 260 microns and a size distribution characterized by the formula: <IMAGE> where % represents the wt. % of the particles below or above the median particle size and M represents the median particle size in microns.
Inventors
- 👤 Carol A. Latham
- 👤 Michael F. McGuiggan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:51
CPC Classifications
C; C09; C09K; C09K5/00; F; F01; F01P; F01P7/00; F01P7/02; F01P7/08; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0373; H05K3/00; H05K3/30; H05K3/303; H05K3/305; H10; H10W; H10W40/00; H10W40/20; H10W40/25; H10W40/251; H05K1/0201; H05K1/0203; H05K2201/00; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0209; Y; Y02; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
66 words
A thermal conductive polymer composition comprising a mixture of a polymer and a thermally conductive filler material, said filler material having a median particle size of between about 130 to 260 microns and a size distribution characterized by the formula: ##EQU3## where % represents the wt. % of the particles below or above the median particle size and M represents the median particle size in microns.
Claim 2
Dependent Claim
66 words
A thermal conductive polymer composition comprising a mixture of a polymer and a thermally conductive filler material, said filler material having a median particle size of between about 130 to 260 microns and a size distribution characterized by the formula: ##EQU3## where % represents the wt. % of the particles below or above the median particle size and M represents the median particle size in microns.
Claim 3
Dependent Claim
13 words
The composition of claim 1 wherein the filler material is an inorganic material.
Claim 4
Dependent Claim
12 words
The composition of claim 2 wherein the filler is plate-like in shape.
Claim 5
Dependent Claim
22 words
The composition of claim 3 wherein the filler is a ceramic material selected from the group consisting of BN, SiC and AlN.
Claim 6
Dependent Claim
20 words
The composition of claim 1 wherein the surface area of the filler material is less than 10 m 2 /g.
Claim 7
Dependent Claim
20 words
The composition of claim 5 wherein the surface area of the filler material is less than 5 m 2 /g.
Claim 8
Dependent Claim
18 words
The composition of claim 4 wherein the ceramic material has a purity of at least 98% by weight.
Claim 9
Dependent Claim
90 words
A process for producing a thermal conductive polymer composite comprising selecting a polymer matrix material and a thermal conductive filler, wherein said filler material has a median particle size of between about 130 to 260 microns and a size distribution characterized by the formula: ##EQU4## where % represents the wt. % of the particles below or above the median particle size and M represents the median particle size in microns, mixing said polymer and filler together under low shear conditions and curing said mixture at an elevated temperature and pressure.
Claim 10
Dependent Claim
90 words
A process for producing a thermal conductive polymer composite comprising selecting a polymer matrix material and a thermal conductive filler, wherein said filler material has a median particle size of between about 130 to 260 microns and a size distribution characterized by the formula: ##EQU4## where % represents the wt. % of the particles below or above the median particle size and M represents the median particle size in microns, mixing said polymer and filler together under low shear conditions and curing said mixture at an elevated temperature and pressure.
Claim 11
Dependent Claim
20 words
The process of claim 8 wherein the filler material is selected from the group consisting of BN, SiC and AlN.
Claim 12
Dependent Claim
21 words
The process of claim 9 wherein the filler material is selected to have a purity of at least 98% by weight.
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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) | 1994-04-29 | 1994-10-29 | 1995-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-29 | 1998-10-29 | 1999-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-29 | 2002-10-29 | 2003-04-30 | $7700.00 | Window Closed / Lapsed |