US4764486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered glass-powder product
Assignee: Panasonic Electric Works Co Ltd
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Filing: 1987-01-16
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Granted: 1988-08-16
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Expires: 2007-01-16
Abstract
Abstract A sintered glass-powder product of a glass ceramic body, consisting essentially of: SiO2, Al2O3, MgO, and B2O3, and sintered at a temperature below 900 DEG C. The product includes a microstructure of alpha-cordierite and magnesium aluminum silicate (MgO.Al2O3.4SiO2) homogeneously dispersed in the glass ceramic body. When the sintered glass-powder product is used in the form of a green sheet for fabricating, in particular, a multilayer wiring substrate or the like, the required sintering temperature for fabricating the substrate can be remarkably reduced so as to be well-matched in thermal characteristics with such wiring conductors as gold, silver, copper, or the like, and even with a relatively large semiconductor chip because the thermal expansion coefficient of the sintered product is close to that of silicon semiconductor.
Inventors
- 👤 Masayuki Ishihara
- 👤 Keizo Makio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:31
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0054; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H10; H10W; H10W70/00; H10W70/60; H10W70/67; H10W70/69; H10W70/692
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
A sintered glass-ceramic body consisting essentially of 48 to 63 wt % of SiO 2 , 10 to 25 wt % of Al 2 O 3 , 10 to 25 wt % or MgO and 4 to less than 10 wt % of B 2 O 3 , wherein said material melts at a temperature below 1450° C. and is sinterable at a temperature below 900° C. where said glass ceramic body has a microstructure that includes a primary crystalline phase alpha-cordierite and a secondary crystalline phase magnesium aluminum silicate (MgO.Al 2 O 3 .4SiO 2 ) which are homogeneously dispersed in said glass ceramic body.
Claim 2
Dependent Claim
106 words
A sintered glass-ceramic body consisting essentially of 48 to 63 wt % of SiO 2 , 10 to 25 wt % of Al 2 O 3 , 10 to 25 wt % or MgO and 4 to less than 10 wt % of B 2 O 3 , wherein said material melts at a temperature below 1450° C. and is sinterable at a temperature below 900° C. where said glass ceramic body has a microstructure that includes a primary crystalline phase alpha-cordierite and a secondary crystalline phase magnesium aluminum silicate (MgO.Al 2 O 3 .4SiO 2 ) which are homogeneously dispersed in said glass ceramic body.
Claim 3
Dependent Claim
34 words
A sintered product according to claim 1, wherein said material is in the form of a glass powder prior to being sintered, said powder being of an average size of 1 to 10 μm.
Claim 4
Dependent Claim
23 words
A sintered product according to claim 1, wherein 3 to 20 wt % of MgO is replaced by an alkaline earth metal oxide.
Claim 5
Dependent Claim
27 words
A sintered product according to claim 3, wherein said alkaline earth metal oxide is one or more selected from a group consisting of BaO, SrO and CaO.
Claim 6
Dependent Claim
64 words
A sintered product acording to claim 3, wherein one or more nucleants selected from a group consisting of TiO 2 , ZrO 2 , MoO 3 , P 2 O 5 , As 2 O 3 , SnO 2 , Ta 2 O 5 and Nb 2 O 5 in an amount of less than 5 wt %, is further added to said material.
Claim 7
Dependent Claim
52 words
A sintered product according to claim 1, wherein a nucleant selected from a group consisting of TiO 2 , ZrO 2 , MoO 3 , P 2 O 5 , As 2 O 3 , SnO 2 , Ta 2 O 5 and Nb 2 O 5 is added to said material.
Claim 8
Dependent Claim
21 words
A sintered product according to claim 6, wherein said nucleant is added to said material by less than 5 wt %.
References Cited (Backward Citations)
CA799407A
Cited
GB1020573A
Cited
US3205079A
Cited
GB1215478A
Cited
FR1539188A
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US3873329A
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US3997351A
Cited
DE2533871A1
Cited
US4301324A
Cited
US4413061A
Cited
US4451516A
Cited
US4358541A
Cited
US4409337A
Cited
US4540671A
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US4650923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |