US4135038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seal structure of ceramics and low expansion metallic material
Assignee: Niterra Co Ltd
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Filing: 1977-12-20
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Granted: 1979-01-16
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Expires: 1997-12-20
Abstract
Abstract A seal structure consisting of a ceramic base and a low-expansion metallic material bonded by a low-melting glass particularly useful for large scale integrated circuit (LSI) applications is disclosed. When using a high alumina ceramics containing 65 to 92% of Al 2 O 3 by weight as a ceramic, the thermal coefficients of expansion are best matched while maintaining a comparatively low dielectric constant by using a composition consisting of 60 to 85% lead borate glass, 10 to 30% β-eucryptite and 0.5 to 15% zircon as a low-melting sealing glass.
Inventors
- 👤 Akio Takami
- 👤 Kazuo Kondo
- 👤 Kazutoshi Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:35
CPC Classifications
H; H10; H10W; H10W76/00; H10W76/10; H10W76/12; H10W76/15; H10W76/157; H10W70/00; H10W70/40; H10W70/421; H10W76/60; H10W72/00; H10W72/50; H10W72/541; H10W72/5449; H10W72/551; H10W72/552; H10W72/5524; H10W72/90; H10W72/931; H10W72/932; Y; Y10; Y10S; Y10S428/00; Y10S428/901
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
A seal structure of ceramics and a low-expansion metallic material, comprising a high alumina ceramics having an Al 2 O 3 content of 65 to 92% by weight and a low-expansion metallic material bonded to each other by a low-melting glass consisting of 60 to 85% by weight of a low-melting glass frit of the lead borate type, 10 to 30% by weight of β-eucryptite having a particle size of 40μm or less and 0.5 to 15% by weight of zircon having a particle size of 10μm or less, the total proportion of the glass ingredients being 100% by weight.
Claim 2
Dependent Claim
100 words
A seal structure of ceramics and a low-expansion metallic material, comprising a high alumina ceramics having an Al 2 O 3 content of 65 to 92% by weight and a low-expansion metallic material bonded to each other by a low-melting glass consisting of 60 to 85% by weight of a low-melting glass frit of the lead borate type, 10 to 30% by weight of β-eucryptite having a particle size of 40μm or less and 0.5 to 15% by weight of zircon having a particle size of 10μm or less, the total proportion of the glass ingredients being 100% by weight.
Claim 3
Dependent Claim
26 words
The seal structure of claim 1 wherein the low-expansion metallic material is selected from the group consisting of an iron-nickel-cobalt alloy and 40-46Ni - iron alloy.
Claim 4
Dependent Claim
30 words
The seal structure of claim 1 wherein the ceramics contains 8 to 35% by weight sintering promoters selected from the group consisting of SiO 2 , MgO, CaO and BaO.
Claim 5
Dependent Claim
15 words
The seal structure of claim 3 wherein the sintering promoter is principally SiO 2 .
Claim 6
Dependent Claim
29 words
The seal structure of claim 1 wherein the low-melting lead borate glass comprises 65 to 90% PbO, 3 to 30% B 2 O 3 and 1 to 30% ZnO.
Claim 7
Dependent Claim
29 words
The seal structure of claim 5 wherein the low-melting lead borate glass comprises 68 to 82% PbO, 6 to 12% B 2 O 3 and 7 to 18% ZnO.
Claim 8
Dependent Claim
38 words
The seal structure of claim 1 wherein the lead borate glass has a coefficient of thermal expansion α=80 × 10 -7 to 130 × 10 -7 ° C -1 and glass transformation temperature of 250 to 400° C.
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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) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |