US4801488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing glass composite
Assignee: Olin Corp
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Filing: 1986-04-07
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Granted: 1989-01-31
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Expires: 2006-04-07
Abstract
Abstract The present direct invention is directed to a sealing glass composite comprising a low melting point sealing glass matrix mixed with a particulate additive to increase the effective coefficient of thermal expansion of the resulting sealing glass composite. The sealing glass matrix is in the lead borate family and the particulate additive is preferably calcium fluoride. The glass composite is particularly useful as a semiconductor package sealant.
Inventors
- 👤 Edward F. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:08
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/24; C03C8/245; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/24926; Y10T428/25; Y10T428/252; Y10T428/256; Y10T428/257; Y10T428/258
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
172 words
A laminate, comprising: a substrate consisting of metal or metal alloy; a glass composite bonded onto at least a portion of a first surface of said substrate, said glass composite comprising: a first component consisting essentially of a vitreous glass matrix selected from the group consisting of lead borate, lead-zinc borate, lead borosilicate and lead-zinc borosilicate glasses, said vitreous glass matrix having a coefficient of thermal expansion in excess of about 80×10 -7 in./in./°C. (from ambient to glass transition temperature); and a second component mixed into said first component to increase the effective coefficient of thermal expansion of the resulting glass composite to be close to that of said substrate, said second component consisting essentially of an effective amount up to about 30 wt. % of an uncoated particulate additive having limited solubility in said vitreous glass matrix, said uncoated particulate additive having a higher coefficient of thermal expansion than that of said vitreous glass matrix, said uncoated particulate additive having a melting point higher than that of said vitreous glass matrix.
Claim 2
Dependent Claim
172 words
A laminate, comprising: a substrate consisting of metal or metal alloy; a glass composite bonded onto at least a portion of a first surface of said substrate, said glass composite comprising: a first component consisting essentially of a vitreous glass matrix selected from the group consisting of lead borate, lead-zinc borate, lead borosilicate and lead-zinc borosilicate glasses, said vitreous glass matrix having a coefficient of thermal expansion in excess of about 80×10 -7 in./in./°C. (from ambient to glass transition temperature); and a second component mixed into said first component to increase the effective coefficient of thermal expansion of the resulting glass composite to be close to that of said substrate, said second component consisting essentially of an effective amount up to about 30 wt. % of an uncoated particulate additive having limited solubility in said vitreous glass matrix, said uncoated particulate additive having a higher coefficient of thermal expansion than that of said vitreous glass matrix, said uncoated particulate additive having a melting point higher than that of said vitreous glass matrix.
Claim 3
Dependent Claim
34 words
The laminate of claim 1 further including a second substrate consisting of metal or metal alloy, said second substrate being bonded to at least a portion of said first substrate by said glass composite.
Claim 4
Dependent Claim
30 words
The multilayer laminate of claim 2 in which said second substrate is substantially parallel to said first substrate, and said glass composite is disposed between said first and second substrates.
Claim 5
Dependent Claim
27 words
The laminate of claim 1 wherein said uncoated particulate additive is present in said glass composite in an amount from about 10 to about 30 wt. %.
Claim 6
Dependent Claim
18 words
The laminate of claim 4 including said uncoated particulate additive being substantially insoluble in said vitreous glass matrix.
Claim 7
Dependent Claim
29 words
The laminate of claim 5 wherein less than about 10 wt. % of the uncoated particulate additive mixed in said glass matrix is soluble in said vitreous glass matrix.
Claim 8
Dependent Claim
27 words
The laminate of claim 6 wherein said glass composite has a coefficient of thermal expansion of above about 138×10 -7 in./in./°C. (from ambient to glass transition temperature).
Claim 9
Dependent Claim
57 words
The laminate of claim 7 wherein said vitreous glass matrix consists essentially of by weight about 70 to about 85% PbO, up to about 20% ZnO, between about 5 to about 15% B 2 O 3 , up to about 10% SiO 2 , up to about 3% BaO and up to about 5% SnO 2 .
Claim 10
Dependent Claim
13 words
The laminate of claim 7 wherein said glass composite is a sealing glass.
Claim 11
Dependent Claim
18 words
The laminate of claim 1 wherein said uncoated particulate is sized from about 10 to about 150 microns.
Claim 12
Dependent Claim
18 words
The laminate of claim 10 wherein said uncoated particulate is sized from about 40 to about 150 microns.
Claim 13
Dependent Claim
16 words
The laminate of claim 10 wherein said glass composite has a sealing temperature above 400° C.
Claim 14
Dependent Claim
20 words
The laminate of claim 12 wherein said glass composite has a sealing temperature from above 400° to about 450° C.
Claim 15
Dependent Claim
22 words
The laminate of claim 13 including said uncoated particulate additive being selected from the group consisting of calcium fluoride and barium fluoride.
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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) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |