Patent US4624934A successfully refreshed from Google Patents.
US4624934A
Expired / Lapsed
US
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Ceramic composition for multilayer printed wiring board
Assignee: AGC Inc
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Filing: 1985-04-30
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Granted: 1986-11-25
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Expires: 2005-04-30
Abstract
Abstract A ceramic composition for a multilayer printed wiring board, consisting essentially of from 35 to 95% by weight of glass powder and from 5 to 65% by weight of refractory filler powder, said refractory filler powder being at least one member selected from the group consisting of α-quartz, corundum, zircon and zirconia and said glass powder consisting essentially of from 25 to 40% by weight of SiO 2 , from 4 to 15% by weight of Al 2 O 3 , from 15 to 25% by weight of B 2 O 3 , from 15 to 40% by weight of BaO+CaO+MgO, from 1 to 10% by weight of ZnO and from 0.5 to 5% by weight of ZrO 2 .
Inventors
- 👤 Yoshinori Kokubu
- 👤 Jiro Chiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:49
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/14; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
A ceramic composition for a multilayer printed wiring board, consisting essentially of: (A) from 35-95% by weight of a glass powder consisting essentially of from 25-40% by weight SiO 2 , from 4-15% by weight Al 2 O 3 , from 15-25% by weight B 2 O 3 , from 15-40% by weight of BaO+CaO+MgO, from 1-10% by weight ZnO and from 0.5-5% by weight ZrO 2 ; and (B) from 5-65% by weight of a refractory filler powder being a material selected from the group consisting of alpha-quartz, corundum, zircon, stabilized zirconia and zirconia.
Claim 2
Dependent Claim
95 words
A ceramic composition for a multilayer printed wiring board, consisting essentially of: (A) from 35-95% by weight of a glass powder consisting essentially of from 25-40% by weight SiO 2 , from 4-15% by weight Al 2 O 3 , from 15-25% by weight B 2 O 3 , from 15-40% by weight of BaO+CaO+MgO, from 1-10% by weight ZnO and from 0.5-5% by weight ZrO 2 ; and (B) from 5-65% by weight of a refractory filler powder being a material selected from the group consisting of alpha-quartz, corundum, zircon, stabilized zirconia and zirconia.
Claim 3
Dependent Claim
21 words
The composition of claim 1, wherein said glass powder component (A) is present in an amount of from 40-90% by weight.
Claim 4
Dependent Claim
59 words
The composition of claim 2, wherein said glass powder component (A) consists essentially of from 28-36% by weight SiO 2 , from 5-14% by weight Al 2 O 3 , from 16-24% by weight B 2 O 3 , from 16-39% by weight BaO+CaO+ MgO, from 2-9% by weight of ZnO and from 1-4% by weight ZrO 2 .
Claim 5
Dependent Claim
14 words
The composition of claim 1, wherein said refractory filler powder (B) is stabilized zirconia.
Claim 6
Dependent Claim
14 words
The composition of claim 2, wherein said refractory filler powder (B) is stabilized zirconia.
Claim 7
Dependent Claim
44 words
The composition of claim 1, wherein said glass powder component (A) additionally comprises a minor amount less than 5% of a coloring agent, SnO 2 to improve the water resistance properties of the composition and PbO to improve the melting properties of the composition.
Claim 8
Dependent Claim
41 words
The composition of claim 1, wherein the average particle size of both the glass powder component (A) and the refractory filler powder (B) ranges from 0.5-5 μm, and the maximum particle size of particles present in each component is 20 μm.
References Cited (Backward Citations)
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JPS565348A
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US4547625A
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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) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |