US4574879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mounting pad for solid-state devices
Assignee: Bergquist Co Inc
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Filing: 1984-02-29
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Granted: 1986-03-11
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Expires: 2004-02-29
Abstract
Abstract A thermally conductive electrically insulative laminate for use as chassis barriers in combination with solid-state electronic devices, the laminate comprising at least three layers and including a pair of outer layers disposed on opposite sides of a center layer. The center layer comprises a film of a polyimide (amide) filled with a quantity of either aluminum oxide or boron nitride particulate solids and included in an amount ranging from between about 10% to about 50% by volume. The outer layers consist essentially of silicone base rubber, and are preferably filled with a quantity of aluminum oxide or boron nitride particulate solids in an amount ranging from between about 25% and 50% by volume.
Inventors
- 👤 David C. DeGree
- 👤 Herbert J. Fick
- 👤 Bruce H. Juenger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:08
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/28; B32B27/281; B32B25/00; B32B25/04; B32B25/08; B32B25/20; B32B27/18; B32B27/20; B32B27/34; B32B2250/00; B32B2250/03; B32B2264/00; B32B2264/10; B32B2305/00; B32B2305/02; B32B2305/028; B32B2307/00; B32B2307/20; B32B2307/206; B32B2307/30; B32B2307/302; B32B2307/304; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31721
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
119 words
A thermally conductive electrically insulative member for use as a chassis mounting barrier in combination with a solid-state electronic device, comprising: (a) a laminate comprising at least three layers and including a pair of outer layers disposed on opposite sides of a center layer, with the center layer having properties distinguishable from those of the outer layers; (b) said center layer comprising a film of polyimide (amide) filled with a quantity of a particulate solid selected from the group consisting of aluminum oxide and boron nitride and being included therein in an amount ranging from between about 10% and 50% by volume particulate solids, balance polyimide (amide) film; (c) said outer layers consisting essentially of compounded silicone base rubber.
Claim 2
Dependent Claim
119 words
A thermally conductive electrically insulative member for use as a chassis mounting barrier in combination with a solid-state electronic device, comprising: (a) a laminate comprising at least three layers and including a pair of outer layers disposed on opposite sides of a center layer, with the center layer having properties distinguishable from those of the outer layers; (b) said center layer comprising a film of polyimide (amide) filled with a quantity of a particulate solid selected from the group consisting of aluminum oxide and boron nitride and being included therein in an amount ranging from between about 10% and 50% by volume particulate solids, balance polyimide (amide) film; (c) said outer layers consisting essentially of compounded silicone base rubber.
Claim 3
Dependent Claim
37 words
The thermally conductive electrically insulative member as defined in claim 1 being particularly characterized in that said silicone rubber layers are filled with a particulate solid selected from the group consisting of aluminum oxide and boron nitride.
Claim 4
Dependent Claim
46 words
The thermally conductive electrically insulative member as defined in claim 2 being particularly characterized in that said particulate solids are included in said silicone rubber outer layers in an amount ranging from between about 25% and 50% by volume particulate solids, balance compounded silicone rubber solids.
Claim 5
Dependent Claim
28 words
The thermally conductive electrically insulative member as defined in claim 1 being particularly characterized in that said polyimide (amide) film contains substantially 35% by volume of boron nitride.
Claim 6
Dependent Claim
42 words
The thermally conductive electrically insulative member as defined in claim 4 being particularly characterized in that said silicone rubber outer layers each contains approximately 35% by volume of a particulate solid selected from the group consisting of aluminum oxide and boron nitride.
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) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |