US3723835A
Expired / Lapsed
US
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Glasses for encapsulating semiconductor devices
Assignee: Motorola Solutions Inc
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Filing: 1971-07-28
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Granted: 1973-03-27
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Expires: 1991-07-28
Abstract
Abstract Alkali-free glasses for encapsulating semiconductor devices, such as zener diodes, wherein preformed (pressing and sintering) glass packages are formed are disclosed. To prevent degradation of the zener diodes, seals compatible with Dumet lead wire are achieved at temperatures below 550*C. The packages consist of a sleeve glass surrounding glass beads which are sealed to the beads and to the sleeve. Preferably the sleeve glass is slightly harder (higher viscosity at a given temperature) than the bead glass.
Inventors
- 👤 E Davis
- 👤 K Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:04
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C3/074; C03C3/0745; C03B; C03B23/00; C03B23/20; H; H10; H10W; H10W72/00; H10W76/00; H10W76/10; H10W76/12; H10W76/13; H10W76/138
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
The composition according to claim 1 wherein the frit of said bead glass comprises percentages by weight of about SiO2 9.0 percent, PbO 64.5 percent, Al2O3 5.0 percent, ZnO 5.0 percent, CdO 1.0 percent, BaO 1.0 percent, MgO 0.5 percent, CaO 0.5 percent, TiO2 3.0 percent, ZrO 0.5 percent, and B2O3 10.0 percent, and the frit of said sleeve glass comprises percentages by weight of about SiO2 10.0 percent, PbO 64.5 percent, Al2O3 6 percent, ZnO 3.0 percent, CdO 1.0 percent, BaO 1.0 percent, MgO 0.5 percent, CaO 0.5 percent, TiO2 3.0 percent, ZrO2 0.5 percent and B2O3 10.0 percent.
Claim 2
Dependent Claim
49 words
The composition according to claim 1 wherein the frits of said bead glass and said sleeve glass comprise percentages by weight of about SiO2 9.0 percent, PbO 66.5 percent, Al2O3 6.5 percent, ZnO 2.0 percent, TiO2 6.0 percent, B2O310.0 percent, CdO, BaO, MgO, CaO and ZrO each zero percent.
Claim 3
Dependent Claim
57 words
The composition according to claim 1 wherein the frits of said bead glass and said sleeve glass comprise percentages by weight of about SiO2 9.0 percent, PbO 64.5 percent, Al2O3 3.0 percent, ZnO 1.0 percent, CdO 3.0 percent, BaO 1.0 percent, MgO 0.5 percent, CaO 0.5 percent, TiO2 7.0 percent, ZrO 0.5 percent and B2O3 10.0 percent.
Claim 4
Dependent Claim
47 words
The composition according to claim 1 wherein the frits of said bead glass and said sleeve glass comprise percentages by weight of about SiO2 9.0, PbO 66.5 percent, Al2O3 6.5, ZnO 3.5, TiO2 4.5 percent, B2O3 10.0 percent, CdO, BaO, MgO, CaO, and ZrO2 each zero percent.
Claim 5
Dependent Claim
13 words
The composition according to claim 1 wherein said device comprises a zener diode.
Claim 6
Dependent Claim
18 words
The encapsulating composition for a semiconductor device according to claim 2 wherein said device comprises a zener diode.
Claim 7
Dependent Claim
110 words
A glass encapsulated zener diode comprising a zener diode chip, leads contacting each side of said chip under stresses developed between said chip and said encapsulation under temperature coefficient of expansion differential, a pair of glass beads, one each of said beads being bonded to one each of said leads, and a glass sleeve surrounding said glass beads and being bonded thereto at a temperature no greater than about 550* C., said glass sleeve being alkali free and being formed by pressing a mixture of ground frit and about 15 percent of Al2O3 and sintering, whereby the glass of said glass sleeve is harder than the glass of said beads.
Claim 8
Dependent Claim
19 words
A glass encapsulated zener diode according to claim 8 wherein the leads contacting said diode are of Dumet wire.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |