Patent US5470804A successfully refreshed from Google Patents.
US5470804A
Expired / Lapsed
US
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Mill additions for sealing glasses
Assignee: Corning Inc
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Filing: 1994-08-03
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Granted: 1995-11-28
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Expires: 2014-08-03
Abstract
Abstract A sealing glass material comprising a thermally crystallizable, PbO--ZnO--B 2 O 3 sealing glass flit and a mill addition selected from alumina, zircon, and manganese dioxide, the mill addition being in an amount sufficient to increase the mechanical strength in a fusion seal to at least 55.2 MPa(8000 psi), but the amount being not over about 5% by weight of the sealing material.
Inventors
- 👤 Robert Morena
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:54
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/02; C03C8/10; C03C8/14; C03C8/04; C03C8/20; C03C8/24; C03C8/245; H; H01; H01J; H01J9/00; H01J9/24; H01J9/244
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
99 words
A material for a fusion-type seal, the material consisting essentially of a thermally crystallizable, PbO--ZnO--B 2 0 3 sealing glass frit and a mill addition, the mill addition consisting essentially of at least one additive that enhances seal strength, that is selected from a group consisting of alumina, zircon, and manganese dioxide, and that is present in an amount sufficient to provide a mechanical strength of at least 55.2 MPas (8000 psi) in a fusion seal made with the material, the amount of additive being at least 2%, but not over about 5% by weight of the sealing material.
Claim 2
Dependent Claim
99 words
A material for a fusion-type seal, the material consisting essentially of a thermally crystallizable, PbO--ZnO--B 2 0 3 sealing glass frit and a mill addition, the mill addition consisting essentially of at least one additive that enhances seal strength, that is selected from a group consisting of alumina, zircon, and manganese dioxide, and that is present in an amount sufficient to provide a mechanical strength of at least 55.2 MPas (8000 psi) in a fusion seal made with the material, the amount of additive being at least 2%, but not over about 5% by weight of the sealing material.
Claim 3
Dependent Claim
17 words
A material in accordance with claim 1 having a mill addition of at least 2% manganese dioxide.
Claim 4
Dependent Claim
32 words
A material in accordance with claim 1 having a mill addition selected from the group consisting of alumina and zircon, the amount of the mill addition being greater than 2% by weight.
Claim 5
Dependent Claim
20 words
A material in accordance with claim 3 wherein the mill addition is alumina in an amount up 5% by weight.
Claim 6
Dependent Claim
102 words
A composite article composed of at least two component parts joined by a fusion seal, the fusion seal being the fused and thermally crystallized product of a sealing glass material consisting essentially of a thermally crystallizable, PbO--ZnO--B 2 0 3 sealing glass frit and a mill addition selected from the group consisting of alumina, zircon, and manganese dioxide, the mill addition being present in an amount sufficient to provide a mechanical strength of at least 55.2 MPas (8000 psi) in the fusion seal, the amount of additive being at least 2%, but not over about 5% by weight of the sealing material.
Claim 7
Dependent Claim
102 words
A composite article composed of at least two component parts joined by a fusion seal, the fusion seal being the fused and thermally crystallized product of a sealing glass material consisting essentially of a thermally crystallizable, PbO--ZnO--B 2 0 3 sealing glass frit and a mill addition selected from the group consisting of alumina, zircon, and manganese dioxide, the mill addition being present in an amount sufficient to provide a mechanical strength of at least 55.2 MPas (8000 psi) in the fusion seal, the amount of additive being at least 2%, but not over about 5% by weight of the sealing material.
Claim 8
Dependent Claim
27 words
A composite article in accordance with claim 5 wherein the article is a cathode ray tube blank comprising funnel and panel members joined by the fusion seal.
Claim 9
Dependent Claim
38 words
A material in accordance with claim 1 wherein the PbO--ZnO--B 2 O 3 glass consists essentially of 68-82% PbO, 8-16% ZnO and 6-12% B 2 0 3 , these three oxides constituting at least 95% of the composition.
Claim 10
Dependent Claim
19 words
A material in accordance with claim 4 wherein the alumina has a mean particle size less than 10 microns.
Claim 11
Dependent Claim
24 words
A material in accordance with claim 1 which is capable of being completely crystallized in less than 27 minutes to form a fusion seal.
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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) | 1998-11-27 | 1999-05-29 | 1999-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-11-27 | 2003-05-29 | 2003-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-11-27 | 2007-05-29 | 2007-11-28 | $7700.00 | Window Closed / Lapsed |