US3964920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solder glass composition and method of using same for encapsulating devices
Assignee: Motorola Solutions Inc
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Filing: 1973-10-26
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Granted: 1976-06-22
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Expires: 1993-10-26
Abstract
Abstract A method for sealing two ceramic pieces, a lead frame and a semiconductor chip together involving the application of pressure to a layer of sealing glass composition which remains vitreous throughout the sealing process is disclosed. The sealing glass composition comprises a mixture of sealing glass and zirconium silicate in the volume percentage amounts of 50-62 percent of glass and 50-38 percent of zirconium silicate. The glass components comprise, as a percentage weight of the glass alone, SiO 2 about 0-2 percent, PbO about 65-72 percent, ZnO about 5-10 percent, PbF 2 about 2-10 percent, CdO about 1-5 percent, TiO 2 about 0.5-3 percent and B 2 O 3 about 10-14 percent.
Inventors
- 👤 Earl K. Davis
- 👤 Kent W. Hansen
- 👤 Duane C. Silvis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:58
CPC Classifications
C; C03; C03C; C03C4/00; C03C14/00; C03C14/004; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C3/074; C03C3/0745; C03C8/00; C03C8/24; C03C8/245; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; C04B37/00; C04B37/003; C04B37/005; H; H10; H10W; H10W70/00; H10W70/40; H10W70/421; H10W74/00; H10W74/40; H10W74/43; H10W76/00; H10W76/60; C03C2214/00; C03C2214/04; C04B2235/00; C04B2235/65; C04B2235/656; C04B2235/6567; C04B2237/00; C04B2237/02; C04B2237/04; C04B2237/06; C04B2237/068; C04B2237/10; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/50; C04B2237/64; C04B2237/70; C04B2237/708; H10W72/00; H10W72/50; H10W72/541; H10W72/5449; H10W72/551; H10W72/552; H10W72/5522; H10W90/00; H10W90/701; H10W90/751; H10W90/756
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
A non-devitrifying solder glass composition consisting essentially of about 50-62 percent by volume of sealing glass and about 50-38 percent by volume of ZrSiO 4 , said sealing glass consisting essentially of by weight: SiO 2 about 0-2 percent, PbO about 65-72 percent, ZnO about 5-10 percent, PbF 2 about 2-10 percent, CdO about 1-5 percent, TiO 2 about 0.5-3 percent and B 2 O 3 about 10-14 percent.
Claim 2
Dependent Claim
69 words
A non-devitrifying solder glass composition consisting essentially of about 50-62 percent by volume of sealing glass and about 50-38 percent by volume of ZrSiO 4 , said sealing glass consisting essentially of by weight: SiO 2 about 0-2 percent, PbO about 65-72 percent, ZnO about 5-10 percent, PbF 2 about 2-10 percent, CdO about 1-5 percent, TiO 2 about 0.5-3 percent and B 2 O 3 about 10-14 percent.
Claim 3
Dependent Claim
53 words
The non-devitrifying solder glass composition according to claim 1 wherein said sealing glass consists essentially of by weight: SiO 2 about 1 percent, PbO about 70 percent, ZnO about 9 percent, PbF 2 about 5 percent, CdO about 2 percent, TiO 2 about 1 percent and B 2 O 3 about 12 percent.
Claim 4
Dependent Claim
36 words
The non-devitrifying solder glass composition according to claim 1 wherein the percentage amounts of sealing glass and ZrSiO 4 are about 50 percent by volume sealing glass and 50 percent by volume ZrSiO 4 , respectively.
Claim 5
Dependent Claim
36 words
The non-devitrifying solder glass composition according to claim 1 wherein the percentage amounts of sealing glass and ZrSiO 4 are about 56 percent by volume sealing glass and 44 percent by volume ZrSiO 4 , respectively.
Claim 6
Dependent Claim
36 words
The non-devitrifying solder glass composition according to claim 1 wherein the percentage amounts of sealing glass and ZrSiO 4 are about 62 percent by volume sealing glass and 38 percent by volume ZrSiO 4 , respectively.
Claim 7
Dependent Claim
80 words
The non-devitrifying solder glass composition according to claim 1 wherein the percentage amounts of sealing glass and ZrSiO 4 are about 56 percent by volume sealing glass and 44 percent by volume ZrSiO 4 , respectively and said sealing glass consists essentially of by weight: SiO 2 about 1 percent, PbO about 70 percent, ZnO about 9 percent, PbF 2 about 5 percent, CdO about 2 percent, TiO 2 about 1 percent and B 2 O 3 about 12 percent.
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) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |