Patent US4515898A successfully refreshed from Google Patents.
US4515898A
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Glass bonding means and method
Assignee: Motorola Solutions Inc
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Filing: 1984-05-25
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Granted: 1985-05-07
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Expires: 2004-05-25
Abstract
Abstract An improved semiconductor die bonding structure and method for electrical devices is described which utilizes a ductile foil between the semiconductor die and the base of the device package. The die is sealed to the foil with a die bonding material formed from a titania free base glass to which has been added 23.6 to 36.4 weight percent lead titanate powder to give a glass plus ceramic mixture consisting essentially of (by weight percent) 2.5-10.7% GeO2, 0-2.3% SiO2, 58.6-78.5% PbO, 0-5.3% PbF2, 7-13% B2O3, 2.5-6.9% Al2O3, 0-5.3% ZnO, 0.4-2.3% V2O5, 0-5.3% CdO, and 6.2-9.6% TiO2. The ductile foil is bonded to the ceramic package base directly without intermediate layers or alternatively by means of an improved foil bonding glass material consisting essentially of (by weight percent) 10-15% SiO2, 45-55% PbO, 8-12% ZnO, 2-5% Al2O3, and 25-30% B2O3.
Inventors
- 👤 Earl K. Davis
- 👤 James E. Drye
- 👤 David J. Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:24
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/24; C03C8/245; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/025; H; H10; H10W; H10W70/00; H10W70/60; H10W70/67; H10W70/69; H10W70/692; H10W72/00; H10W72/30; H10W76/00; H10W76/60; C04B2237/00; C04B2237/02; C04B2237/10; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/40; C04B2237/402; C04B2237/50; C04B2237/70; C04B2237/708; C04B2237/84; C04B2237/86; H10W70/68; H10W70/682; H10W72/071; H10W72/073; H10W72/07331; H10W72/07337; H10W72/351; H10W72/353; H10W72/354; H10W72/381
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
53 words
A glass material consisting essentially of a composition by weight percent of: ______________________________________
GeO.sub.2
4-14
SiO.sub.2
0-4
PbO 50-80
PbF.sub.2
0-7
B.sub.2 O.sub.3
11-17
Al.sub.2 O.sub.3
4-9
ZnO 0-7
V.sub.2 O.sub.5
0.6-3
CdO 0-7
______________________________________ and having a coefficient of thermal expansion in the range 84-87×10 -7 /°C. from 25° to 300° C.
Claim 2
Dependent Claim
53 words
A glass material consisting essentially of a composition by weight percent of: ______________________________________
GeO.sub.2
4-14
SiO.sub.2
0-4
PbO 50-80
PbF.sub.2
0-7
B.sub.2 O.sub.3
11-17
Al.sub.2 O.sub.3
4-9
ZnO 0-7
V.sub.2 O.sub.5
0.6-3
CdO 0-7
______________________________________ and having a coefficient of thermal expansion in the range 84-87×10 -7 /°C. from 25° to 300° C.
Claim 3
Dependent Claim
74 words
A glass plus ceramic mixture having a coefficient of thermal expansion in the range of about 59-65×10 -7 /°C. (25°-300° C.), comprising a powdered base glass of composition by weight percent consisting essentially of: ______________________________________
GeO.sub.2
4-14
SiO.sub.2
0-4
PbO 50-80
PbF.sub.2
0-7
B.sub.2 O.sub.3
11-17
Al.sub.2 O.sub.3
4-9
ZnO 0-7
V.sub.2 O.sub.5
0.6-3
CdO 0-7;
______________________________________ plus 23.6 to 36.4 weight percent powdered lead titanate, the combination forming said glass plus ceramic mixture.
Claim 4
Dependent Claim
74 words
A glass plus ceramic mixture having a coefficient of thermal expansion in the range of about 59-65×10 -7 /°C. (25°-300° C.), comprising a powdered base glass of composition by weight percent consisting essentially of: ______________________________________
GeO.sub.2
4-14
SiO.sub.2
0-4
PbO 50-80
PbF.sub.2
0-7
B.sub.2 O.sub.3
11-17
Al.sub.2 O.sub.3
4-9
ZnO 0-7
V.sub.2 O.sub.5
0.6-3
CdO 0-7;
______________________________________ plus 23.6 to 36.4 weight percent powdered lead titanate, the combination forming said glass plus ceramic mixture.
Claim 5
Dependent Claim
79 words
A glass containing material comprising an admixture of a titania free crushed base glass having a coefficient of thermal expansion in the range 84-87×10 -7 /°C. from 25° to 300° C., and 23.6 to 36.4 weight percent lead titanate powder, wherein the mixture consists essentially of ingredients by weight percentage in the range of: ______________________________________
GeO.sub.2
2.5-10.7
SiO.sub.2
0-2.3
PbO 58.6-78.5
PbF.sub.2
0-5.3
B.sub.2 O.sub.3
7.0-13.0
Al.sub.2 O.sub.3
2.5-6.9
ZnO 0-5.3
V.sub.2 O.sub.5
0.4-2.3
CdO 0-5.3
TiO.sub.2
6.2-9.6
______________________________________
Claim 6
Dependent Claim
79 words
A glass containing material comprising an admixture of a titania free crushed base glass having a coefficient of thermal expansion in the range 84-87×10 -7 /°C. from 25° to 300° C., and 23.6 to 36.4 weight percent lead titanate powder, wherein the mixture consists essentially of ingredients by weight percentage in the range of: ______________________________________
GeO.sub.2
2.5-10.7
SiO.sub.2
0-2.3
PbO 58.6-78.5
PbF.sub.2
0-5.3
B.sub.2 O.sub.3
7.0-13.0
Al.sub.2 O.sub.3
2.5-6.9
ZnO 0-5.3
V.sub.2 O.sub.5
0.4-2.3
CdO 0-5.3
TiO.sub.2
6.2-9.6
______________________________________
References Cited (Backward Citations)
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Cited
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Cited
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Cited
US4184189A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-06 | 1988-11-05 | 1989-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-06 | 1992-11-05 | 1993-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-06 | 1996-11-05 | 1997-05-07 | $7700.00 | Window Closed / Lapsed |