US5516733A
Expired / Lapsed
US
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Fusion seal and sealing mixtures
Assignee: Corning Inc
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Filing: 1995-08-08
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Granted: 1996-05-14
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Expires: 2015-08-08
Abstract
Abstract A fusion seal between two surfaces, and a material to produce the seal, consist essentially of 60-90 percent by weight of a SnO--ZnO--P 2 O 5 glass frit and 10-40 percent by weight of a mill addition including alumina and, optionally, zircon, the alumina content being at least 10% when it constitutes the mill addition and not over 20% in conjunction with zircon, 0-15 % of a further additive that reduces the effective CTE of the seal, the mill addition being present in a sufficient amount to cause a substantial change in viscosity-temperature characteristics of the material after formation of a seal. The effect of the mill addition on viscosity in a fusion seal finds particular application in uniting the faceplate and funnel members to form a cathode ray tube envelope.
Inventors
- 👤 Robert Morena
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:53
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C3/21; C03C8/00; C03C8/24
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
117 words
A fusion seal between the surfaces of two bodies, the fusion seal consisting essentially of 60-90% by weight of a SnO--ZnO--P 2 O 5 glass frit wherein the SnO and ZnO are present in the glass in a molar ratio of 5:1 to 2:1, and 10-40 percent by weight of a mill addition comprising alumina and, optionally, zircon, the alumina content being at least 10% when it constitutes the mill addition and not over 20% in conjunction with zircon, the total amount of alumina and zircon being 10-40%, the seal having a phosphate crystal phase crystallized in situ which, in combination with the mill addition, causes a substantial change in the viscosity temperature characteristics of the seal.
Claim 2
Dependent Claim
117 words
A fusion seal between the surfaces of two bodies, the fusion seal consisting essentially of 60-90% by weight of a SnO--ZnO--P 2 O 5 glass frit wherein the SnO and ZnO are present in the glass in a molar ratio of 5:1 to 2:1, and 10-40 percent by weight of a mill addition comprising alumina and, optionally, zircon, the alumina content being at least 10% when it constitutes the mill addition and not over 20% in conjunction with zircon, the total amount of alumina and zircon being 10-40%, the seal having a phosphate crystal phase crystallized in situ which, in combination with the mill addition, causes a substantial change in the viscosity temperature characteristics of the seal.
Claim 3
Dependent Claim
19 words
A fusion seal in accordance with claim 1 wherein the phosphate crystal phase constitutes about 5-10% of the seal.
Claim 4
Dependent Claim
21 words
A fusion seal in accordance with claim 1 wherein the mill addition constitutes 20-35 percent by weight based on the seal.
Claim 5
Dependent Claim
42 words
A fusion seal in accordance with claim 1 wherein the mill addition contains a further additive that reduces the effective CTE of the seal, the further additive being present in an amount not over about 15 percent by weight of the seal.
Claim 6
Dependent Claim
33 words
A fusion seal in accordance with claim 4 wherein the further additive is selected from the group composed of cordierite, metal pyrophosphates, silica glasses, quartz, Invar and solid solutions of beta-spodumene and beta-eucryptite.
Claim 7
Dependent Claim
52 words
A fusion seal in accordance with claim 1 wherein the glass flit consists essentially of 30-50 mole % P 2 O 5 , B 2 O 3 in an amount not over about 3 mole % with the P 2 O 5 +B 2 O 3 content being about 30-50 mole %.
Claim 8
Dependent Claim
61 words
A fusion seal in accordance with claim 6 wherein the glass frit optionally contains at least one modifying oxide selected from the group composed of up to 5 mole % SiO 2 , up to 20 mole % B 2 O 3 , up to 5 mole % Al 2 O 3 and up to 5 mole % WO 3 .
Claim 9
Dependent Claim
14 words
A fusion seal in accordance with claim 6 wherein the molar ratio is 3.5-4.5:1.
Claim 10
Dependent Claim
118 words
A fusion sealing material consisting essentially of 60-90% by weight of a SnO--ZnO--P 2 O 5 glass frit wherein the SnO and ZnO are present in the glass in a molar ratio of 5:1 to 2:1, and 10-40 percent by weight of a mill addition comprising alumina and, optionally, zircon, the alumina content being at least 10% when it constitutes the mill addition and not over 20% in conjunction with zircon, the total amount of alumina and zircon being 10-40%, the sealing material being capable of thermal treatment to develop a phosphate crystal phase that substantially changes the effective the viscosity temperature characteristics of a seal formed from the material whereby the seal does not soften upon reheating.
Claim 11
Dependent Claim
118 words
A fusion sealing material consisting essentially of 60-90% by weight of a SnO--ZnO--P 2 O 5 glass frit wherein the SnO and ZnO are present in the glass in a molar ratio of 5:1 to 2:1, and 10-40 percent by weight of a mill addition comprising alumina and, optionally, zircon, the alumina content being at least 10% when it constitutes the mill addition and not over 20% in conjunction with zircon, the total amount of alumina and zircon being 10-40%, the sealing material being capable of thermal treatment to develop a phosphate crystal phase that substantially changes the effective the viscosity temperature characteristics of a seal formed from the material whereby the seal does not soften upon reheating.
Claim 12
Dependent Claim
29 words
A fusion sealing material in accordance with claim 9 wherein the mill addition comprises, in weight percent, 15-40% zircon in admixture with alumina in an amount less than 15%.
Claim 13
Dependent Claim
20 words
A fusion sealing material in accordance with claim 9 wherein the mill addition comprises, in weight percent, 10-30% alumina alone.
Claim 14
Dependent Claim
23 words
A fusion sealing material in accordance with claim 9 wherein the mill addition is 20-35 percent by weight based on the sealing material.
Claim 15
Dependent Claim
44 words
A fusion sealing material in accordance with claim 9 wherein the mill addition contains a further additive that reduces the effective CTE of a seal formed from the material, the further additive not being over about 15 percent by weight of the sealing material.
Claim 16
Dependent Claim
34 words
A fusion sealing material in accordance with claim 13 wherein the further additive is selected from the group consisting of cordierite, metal pyrophosphates, silica glasses, quartz, Invar and solid solutions of beta-spodumene and beta-eucryptite.
Claim 17
Dependent Claim
74 words
A fusion sealing material in accordance with claim 10 wherein the glass flit consists essentially of 30-50 mole % P 2 O 5 , and optionally contains at least one modifying oxide selected from the group consisting of up to 5 mole % SiO 2 , up to 3 mole % B 2 O 3 , up to 5 mole % Al 2 O 3 and up to 5 mole % WO 3 .
Claim 18
Dependent Claim
17 words
A fusion sealing material in accordance with claim 15 wherein the SnO:ZnO ratio is 3.5:1 to 4.5:1.
Claim 19
Dependent Claim
30 words
A fusion sealing material in accordance with claim 9 that is capable of forming up to about 10% of a phosphate crystal phase when heated to a form a seal.
Claim 20
Dependent Claim
37 words
A fusion sealing material in accordance with claim 9 wherein the glass frit contains B 2 O 3 in an amount sufficient to decrease the CTE of the glass frit, but not over about 3 mole percent.
Claim 21
Dependent Claim
42 words
A fusion sealing material in accordance with claim 18 wherein the B 2 O 3 is substituted for P 2 O 5 in the glass flit and the total P 2 O 5 +B 2 O 3 is about 33 mole %.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-05-14 | 1999-11-13 | 2000-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-14 | 2003-11-13 | 2004-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-14 | 2007-11-13 | 2008-05-14 | $7700.00 | Window Closed / Lapsed |