Patent US3970464A successfully refreshed from Google Patents.
US3970464A
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Silica-free, alkali metal-free and lead-free sealing glasses
Assignee: OI Glass Inc
•
Filing: 1975-02-10
•
Granted: 1976-07-20
•
Expires: 1995-02-10
Abstract
Abstract Zinc borate sealing glasses free of silica, alkali metal oxide and lead are disclosed for use in sealing and encapsulation, particularly in connection with semi-conductor devices and electronic components which are sensitive to alkali metal and lead. The glasses have coefficients of thermal expansion in the range of about 35 to 55 x 10<->7/ DEG C, fiber softening temperatures in the range of about 600 DEG to 675 DEG C and annealing point temperatures in the range of about 500 to 580 DEG C.
Inventors
- 👤 James Allen Shell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:45
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/14; C03C3/145; C03C3/253; C03C8/00; C03C8/24
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
116 words
A sealing glass composition that is lead free, alkali metal free and free of silica which consists essentially of the following components in the indicated mole percent ranges based upon the total composition: Component Mole Percent
______________________________________
ZnO 50-55
B.sub.2 O.sub.3
35-45
______________________________________ the total mole percent amount of ZnO and B 2 O 3 being not greater than about 95 mole percent and the balance of said composition alternatively consisting of (a) about 5 mole percent of GeO 2 , or (b) about 5 mole percent of Al 2 O 3 together with at least one of the following: Component Mole Percent
______________________________________
CaO 0-5
CuO 0-5
GeO.sub.2 0.5
V.sub.2 O.sub.5
0-2.5
MgO 0-5.
______________________________________
Claim 2
Dependent Claim
116 words
A sealing glass composition that is lead free, alkali metal free and free of silica which consists essentially of the following components in the indicated mole percent ranges based upon the total composition: Component Mole Percent
______________________________________
ZnO 50-55
B.sub.2 O.sub.3
35-45
______________________________________ the total mole percent amount of ZnO and B 2 O 3 being not greater than about 95 mole percent and the balance of said composition alternatively consisting of (a) about 5 mole percent of GeO 2 , or (b) about 5 mole percent of Al 2 O 3 together with at least one of the following: Component Mole Percent
______________________________________
CaO 0-5
CuO 0-5
GeO.sub.2 0.5
V.sub.2 O.sub.5
0-2.5
MgO 0-5.
______________________________________
Claim 3
Dependent Claim
32 words
The sealing glass composition as set forth in claim 1 wherein the coefficient of thermal expansion ranges from 35 to 55 × 10.sup. -7 /°C over the range of 0° to 300°C.
Claim 4
Dependent Claim
32 words
The sealing glass composition as set forth in claim 1 wherein the coefficient of thermal expansion ranges from 40 to 50 × 10.sup. -7 /°C over the range of 0° to 300°C.
Claim 5
Dependent Claim
19 words
The sealing glass composition as set forth in claim 1 wherein the softening point ranges from 600° to 675°C.
Claim 6
Dependent Claim
19 words
The sealing glass composition as set forth in claim 1 wherein the softening point ranges from 610° to 660°C.
Claim 7
Dependent Claim
19 words
The sealing glass composition as set forth in claim 1 wherein the annealing point ranges from 500° to 580°C.
Claim 8
Dependent Claim
29 words
The sealing glass composition as set forth in claim 1 of the following composition: Component Mole Percent
______________________________________
ZnO 50
Al.sub.2 O.sub.3
5
B.sub.2 O.sub.3
40
CuO 5.
______________________________________
Claim 9
Dependent Claim
30 words
The sealing glass composition as set forth in claim 1 of the following composition: Component Mole Percent
______________________________________
ZnO 55
Al.sub.2 O.sub.3
5
B.sub.2 O.sub.3
37.5
V.sub.2 O.sub.5
2.5.
______________________________________
Claim 10
Dependent Claim
29 words
The sealing glass composition as set forth in claim 1 of the following composition: Component Mole Percent
______________________________________
ZnO 50
Al.sub.2 O.sub.3
5
B.sub.2 O.sub.3
40
MgO 5.
______________________________________
Claim 11
Dependent Claim
29 words
The sealing glass composition as set forth in claim 1 of the following composition: Component Mole Percent
______________________________________
ZnO 50
Al.sub.2 O.sub.3
5
B.sub.2 O.sub.3
40
CaO 5.
______________________________________
Claim 12
Dependent Claim
31 words
The sealing glass composition as set forth in claim 1 of the following composition: Component Mole Percent
______________________________________
ZnO 50
Al.sub.2 O.sub.3
5
B.sub.2 O.sub.3
40
CaO 2.5
MgO 2.5.
______________________________________
Claim 13
Dependent Claim
45 words
A sealing glass composition that is lead free, alkali metal free and free of silica which consists essentially of the following components in the indicated mole percent ranges based upon the total composition: Component Mole Percent
______________________________________
ZnO 55
B.sub.2 O.sub.3
40
GeO.sub.2 5.
______________________________________
Claim 14
Dependent Claim
45 words
A sealing glass composition that is lead free, alkali metal free and free of silica which consists essentially of the following components in the indicated mole percent ranges based upon the total composition: Component Mole Percent
______________________________________
ZnO 55
B.sub.2 O.sub.3
40
GeO.sub.2 5.
______________________________________
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) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |