US3923530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric glass composition
Assignee: International Business Machines Corp
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Filing: 1973-06-27
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Granted: 1975-12-02
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Expires: 1993-06-27
Abstract
Abstract A family of dielectric glasses having properties such that, when heat is applied to seal the dielectric glasses, there is no crazing in a MgO overcoat. These dielectric glasses have such viscosity properties as not to craze a MgO overcoat in the range 455 to 505*C corresponding to log viscosity of 10.3 poises and yet fire into good dielectric films at about 600*C. The glass has substantially the following constituents: D R A W I N G
Inventors
- 👤 Thomas A Sherk
- 👤 Rao R Tummala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:32
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/087; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C3/076; C03C3/089; C03C3/091; C03C4/00; C03C4/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
53 words
A DIELECTRIC GLASS HAVING A THERMAL COEFFICIENT OF EXPANSION (FROM ROOM TEMPERATURE TO 300*C) IN THE RANGE OF APPROXIMATELY 81.6-86.0 X 10**7 PER *C AND A CRAZING TEMPERATURE WITH RESPECT TO A MAGNESIUM OXIDE OVERCOAT IN THE RANGE OF APPROXIMATELY 455* - 505*C, CONSISTING ESSENTIALLY OF THE FOLLOWING INGREDIENTS IN THE FOLLOWING PROPORTIONS:
Claim 2
Dependent Claim
53 words
A DIELECTRIC GLASS HAVING A THERMAL COEFFICIENT OF EXPANSION (FROM ROOM TEMPERATURE TO 300*C) IN THE RANGE OF APPROXIMATELY 81.6-86.0 X 10**7 PER *C AND A CRAZING TEMPERATURE WITH RESPECT TO A MAGNESIUM OXIDE OVERCOAT IN THE RANGE OF APPROXIMATELY 455* - 505*C, CONSISTING ESSENTIALLY OF THE FOLLOWING INGREDIENTS IN THE FOLLOWING PROPORTIONS:
Claim 3
Dependent Claim
37 words
The dielectric glass of claim 1 wherein there is 62.4 - 66.6 percent by weight PbO, 13.6 - 18.4 percent by weight B2O3, 11.0 -13.6 percent by weight SiO2 and 0.0 - 3.0 percent by weight MgO.
Claim 4
Dependent Claim
55 words
A dielectric glass having a thermal coefficient of expansion (from room temperature to 300*C) in the range of approximately 82 - 83 X 10 7 per *C and a crazing temperature with respect to a magnesium oxide overcoat in the range of approximately 485* -505*C, consisting essentially of the following ingredients in the following proportions:
Claim 5
Dependent Claim
55 words
A dielectric glass having a thermal coefficient of expansion (from room temperature to 300*C) in the range of approximately 82 - 83 X 10 7 per *C and a crazing temperature with respect to a magnesium oxide overcoat in the range of approximately 485* -505*C, consisting essentially of the following ingredients in the following proportions:
Claim 6
Dependent Claim
30 words
A dielectric glass in accordance with claim 3 consisting essentially of: 66.0 percent PbO, 18.4 percent B2O3, 11.0 percent SiO2, 0.2 percent Al2O3, 2.2 percent CaO and 2.2 percent MgO.
Claim 7
Dependent Claim
30 words
A dielectric glass in accordance with claim 3 consisting essentially of: 64.4 percent PbO, 17.0 percent B2O3, 12.0 percent SiO2, 0.2 percent Al2O3, 3.4 percent CaO and 3.0 percent MgO.
Claim 8
Dependent Claim
30 words
A dielectric glass in accordance with claim 3 consisting essentially of: 63.4 percent PbO, 17.0 percent B2O3, 12.0 percent SiO2, 0.2 percent Al2O3, 4.4 percent CaO and 3.0 percent MgO.
Claim 9
Dependent Claim
30 words
A dielectric glass in accordance with claim 3 consisting essentially of: 62.4 percent PbO, 16.0 percent B2O3, 13.0 percent SiO2, 0.2 percent Al2O3, 5.4. percent CaO and 3.0 percent MgO.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |