US4812422A
Expired / Lapsed
US
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Dielectric paste and method of manufacturing the paste
Assignee: Panasonic Holdings Corp
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Filing: 1986-06-03
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Granted: 1989-03-14
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Expires: 2006-06-03
Abstract
Abstract Disclosed is a dielectric paste for a ceramic multilayer wiring substrate, of which feature, among others, lies in the composition of inorganic components comprised of ceramics made of Al2O3, SiO2, CaO and MgO, and a borosilicate glass. This can be prepared by mixing a part of the glass with the ceramic, calcining the mixture at a high temperature, and then adding the remaining glass to mix with the calcined product. The insulation layer is densely formed, and a dielectric paste excelling in electric insulating property can be obtained by mixing this composition with an organic liquid.
Inventors
- 👤 Satoru Yuhaku
- 👤 Seiichi Nakatani
- 👤 Tsutomu Nishimura
- 👤 Toru Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:34
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; H01; H01B; H01B3/00; H01B3/02; H01B3/10; H05K3/00; H05K3/46; H05K3/4611; H05K3/4626; H05K3/4629
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
68 words
A dielectric paste which comprises a ceramic comprising 90 to 98 wt.% of Al 2 O 3 , 1 to 5 wt.% of SiO 2 , 0.2 to 2 wt.% of CaO, and 0.5 to 4 wt.% of MgO, with the total weight reaching 100%; a borosilicate glass; and an organic liquid vehicle wherein the ratio of the glass to the ceramic by weight is 40/60 to 60/40.
Claim 2
Dependent Claim
68 words
A dielectric paste which comprises a ceramic comprising 90 to 98 wt.% of Al 2 O 3 , 1 to 5 wt.% of SiO 2 , 0.2 to 2 wt.% of CaO, and 0.5 to 4 wt.% of MgO, with the total weight reaching 100%; a borosilicate glass; and an organic liquid vehicle wherein the ratio of the glass to the ceramic by weight is 40/60 to 60/40.
Claim 3
Dependent Claim
74 words
A dielectric paste as set forth in claim 1, wherein the composition of the borosilicate glass is comprises 60 to 90 wt.% of SiO 2 , 5 to 30 wt.% of B 2 O 3 , 0.1 to 10 wt.% of Al 2 O 3 , 0.1 to 10 wt.% of BaO, and 0.01 to 5 wt.% of M 2 O in which M is an alkaline metal, with the total weight reaching 100%.
Claim 4
Dependent Claim
116 words
A dielectric paste as set forth in claim 1, wherein the ceramic composition is comprises 90 to 98 wt.% of Al 2 O 3 , 1 to 5 wt.% of SiO 2 , 0.2 to 2 wt.% of CaO, and 0.5 to 4 wt.% of MgO, with the total weight reaching 100%, and the composition of the borosilicate glass is comprises 60 to 90 wt.% of SiO 2 , 5 to 30 wt.% of B 2 O 3 , 0.1 to 10 wt.% of Al 2 O 3 , 0.1 to 10 wt.% of BaO, and 0.01 to 5 wt.% of M 2 O in which is an alkaline metal, with the total weight reaching 100%.
References Cited (Backward Citations)
US4152282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |