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US3935019A
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Glasses and glass-ceramics
Assignee: OI Glass Inc
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Filing: 1974-02-12
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Granted: 1976-01-27
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Expires: 1994-02-12
Abstract
Abstract Thermally crystallizable glasses are disclosed of the system: RO - Nb2O5 - GeO2 wherein RO is a BaO or SrO. Also disclosed are thermally crystallizable glasses of the system PbO - Nb2O5 - GeO2. Glass-ceramics made from these glass systems have high dielectric constants and low dissipation factors or loss tangents, which glasses and glass-ceramics are suitable for use as capacitors and dielectrics, and particularly for thick-film dielectric pastes utilized in the manufacture of micro-electronic printed circuits. By varying the heat treatment schedule for crystallization of the glass to a glass-ceramic, a specific high dielectric constant coming within a prescribed range can be imparted to the finished glass-ceramic.
Inventors
- 👤 James Erich Rapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:45
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/129; C; C03; C03C; C03C10/00; C03C10/0054; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/087
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A thermally crystallizable glass suitable for crystallization to a glass-ceramic having good dielectric properties and an index of refraction in said glass-ceramic in excess of 2.000 and higher than the index of refraction of said glass, said glass consisting essentially of the following composition: Ingredient Mole Percent
______________________________________
GeO.sub.2 35 - 60
Nb.sub.2 O.sub.5 19 - 35
PbO 16 - 35
______________________________________ wherein the molar ratio of Nb 2 O 5 to PbO ranges from about 0.9:1 to about 1.5:1.
Claim 2
Dependent Claim
80 words
A thermally crystallizable glass suitable for crystallization to a glass-ceramic having good dielectric properties and an index of refraction in said glass-ceramic in excess of 2.000 and higher than the index of refraction of said glass, said glass consisting essentially of the following composition: Ingredient Mole Percent
______________________________________
GeO.sub.2 35 - 60
Nb.sub.2 O.sub.5 19 - 35
PbO 16 - 35
______________________________________ wherein the molar ratio of Nb 2 O 5 to PbO ranges from about 0.9:1 to about 1.5:1.
Claim 3
Dependent Claim
92 words
A glass-ceramic body having good dielectric properties including a dielectric constant in excess of 50 (Room temperature 0.5 MHz) and a dissipation factor of less than 2%, said glass-ceramic body being formed by thermal in situ crystallization of a glass body consisting essentially of the following composition: Ingredient Mole Percent
______________________________________
GeO.sub.2 39 - 52
Nb.sub.2 O.sub.5 27 - 41
RO 16 - 26
______________________________________ wherein said RO is SrO or BaO and the molar ratio of said Nb 2 O 5 to said RO is from about 1:3 to about 2:1.
Claim 4
Dependent Claim
92 words
A glass-ceramic body having good dielectric properties including a dielectric constant in excess of 50 (Room temperature 0.5 MHz) and a dissipation factor of less than 2%, said glass-ceramic body being formed by thermal in situ crystallization of a glass body consisting essentially of the following composition: Ingredient Mole Percent
______________________________________
GeO.sub.2 39 - 52
Nb.sub.2 O.sub.5 27 - 41
RO 16 - 26
______________________________________ wherein said RO is SrO or BaO and the molar ratio of said Nb 2 O 5 to said RO is from about 1:3 to about 2:1.
Claim 5
Dependent Claim
83 words
A glass-ceramic body having good dielectric properties including a dielectric constant in excess of 50 (Room temperature 0.5 MHz) and a dissipation factor of less than 2%, said glass-ceramic body being formed by thermal in situ crystallization of a glass body consisting essentially of the following composition: Ingredient Mole Percent
______________________________________
GeO.sub.2 35 - 60
Nb.sub.2 O.sub.5 19 - 35
PbO 16 - 35
______________________________________ wherein the molar ratio of Nb 2 O 5 to PbO ranges from about 0.9:1 to about 1.5:1.
Claim 6
Dependent Claim
83 words
A glass-ceramic body having good dielectric properties including a dielectric constant in excess of 50 (Room temperature 0.5 MHz) and a dissipation factor of less than 2%, said glass-ceramic body being formed by thermal in situ crystallization of a glass body consisting essentially of the following composition: Ingredient Mole Percent
______________________________________
GeO.sub.2 35 - 60
Nb.sub.2 O.sub.5 19 - 35
PbO 16 - 35
______________________________________ wherein the molar ratio of Nb 2 O 5 to PbO ranges from about 0.9:1 to about 1.5:1.
Claim 7
Dependent Claim
85 words
A transparent glass-ceramic body having an index of refraction in excess of 2.000, said glass-ceramic body being formed by thermal in situ crystallization of a glass body having a lower index of refraction and consisting essentially of the following composition: Ingredient Mole Percent
______________________________________
GeO.sub.2 39 - 52
Nb.sub.2 O.sub.5 27 - 41
RO 16 - 26
______________________________________ wherein said RO is SrO or BaO and the molar ratio of said Nb 2 O 5 to said RO is from about 1:3 to about 2:1.
Claim 8
Dependent Claim
85 words
A transparent glass-ceramic body having an index of refraction in excess of 2.000, said glass-ceramic body being formed by thermal in situ crystallization of a glass body having a lower index of refraction and consisting essentially of the following composition: Ingredient Mole Percent
______________________________________
GeO.sub.2 39 - 52
Nb.sub.2 O.sub.5 27 - 41
RO 16 - 26
______________________________________ wherein said RO is SrO or BaO and the molar ratio of said Nb 2 O 5 to said RO is from about 1:3 to about 2:1.
Claim 9
Dependent Claim
76 words
A transparent glass-ceramic body having an index of refraction in excess of 2.000, said glass-ceramic body being formed by thermal in situ crystallization of a glass body having a lower index of refraction and consisting essentially of the following composition: Ingredient Mole Percent
______________________________________
GeO.sub.2 35 - 60
Nb.sub.2 O.sub.5 19 - 35
PbO 16 - 35
______________________________________ wherein the molar ratio of Nb 2 O 5 to PbO ranges from about 0.9:1 to about 1.5:1.
Claim 10
Dependent Claim
76 words
A transparent glass-ceramic body having an index of refraction in excess of 2.000, said glass-ceramic body being formed by thermal in situ crystallization of a glass body having a lower index of refraction and consisting essentially of the following composition: Ingredient Mole Percent
______________________________________
GeO.sub.2 35 - 60
Nb.sub.2 O.sub.5 19 - 35
PbO 16 - 35
______________________________________ wherein the molar ratio of Nb 2 O 5 to PbO ranges from about 0.9:1 to about 1.5:1.
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) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |