US5089445A
Expired / Lapsed
US
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Fusion sealing materials
Assignee: Corning Inc
•
Filing: 1990-10-09
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Granted: 1992-02-18
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Expires: 2010-10-09
Abstract
Abstract There is disclosed a sealing material based on a lead sealing glass having a mill addition of a crystalline material having the crystalline structure of magnesium pyrophosphate. The effective coefficient of thermal expansion in a seal is substantially reduced by the mill addition, thereby permitting use with low expansion materials.
Inventors
- 👤 Gaylord L. Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:51
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/14; C03C8/24; C03C8/245
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
87 words
A sealing material comprising a lead sealing glass and a mill addition of a pyrophosphate crystalline material selected from the group consisting of magnesium pyrophosphate, a magnesium pyrophosphate with at least a portion of the magnesium ions replaced by at least one cation selected from the group composed of cobalt, arsenic, zinc, iron, aluminum and zirconium, and a crystallized phosphate glass composed essentially of P 2 O 5 and one or more cations selected from the group composed of magnesium, cobalt, arsenic, zinc, iron, aluminum and zirconium.
Claim 2
Dependent Claim
87 words
A sealing material comprising a lead sealing glass and a mill addition of a pyrophosphate crystalline material selected from the group consisting of magnesium pyrophosphate, a magnesium pyrophosphate with at least a portion of the magnesium ions replaced by at least one cation selected from the group composed of cobalt, arsenic, zinc, iron, aluminum and zirconium, and a crystallized phosphate glass composed essentially of P 2 O 5 and one or more cations selected from the group composed of magnesium, cobalt, arsenic, zinc, iron, aluminum and zirconium.
Claim 3
Dependent Claim
18 words
A sealing material in accordance with claim 1 wherein the lead sealing glass is a lead borate glass.
Claim 4
Dependent Claim
19 words
A sealing material in accordance with claim 2 wherein the lead sealing glass is a lead zinc borate glass.
Claim 5
Dependent Claim
17 words
A sealing material in accordance with claim 1 wherein the lead sealing glass is a lead borosilicate.
Claim 6
Dependent Claim
18 words
A sealing material in accordance with claim 1 wherein the lead sealing glass is a lead titanate glass.
Claim 7
Dependent Claim
15 words
A sealing material in accordance with claim 1 wherein the mill addition is magnesium pyrophosphate.
Claim 8
Dependent Claim
41 words
A sealing material in accordance with claim 1 wherein the mill addition is magnesium pyrophosphate with a portion of the magnesium cations replaced by at least one cation selected from the group composed of cobalt, arsenic, zinc, iron, aluminum, and zirconium.
Claim 9
Dependent Claim
18 words
A sealing material in accordance with claim 7 wherein the replacing cation in the magnesium pyrophosphate is cobalt.
Claim 10
Dependent Claim
18 words
A sealing material in accordance with claim 7 wherein the replacing cation in the magnesium pyrophosphate is zinc.
Claim 11
Dependent Claim
60 words
A sealing material in accordance with claim 1 wherein the selected mill addition is composed of at least two different pyrophosphate crystalline materials with at least one being a magnesium pyrophosphate with at least a portion of the magnesium cations being replaced by at least one cation selected from the group composed of cobalt, arsenic, zinc, iron, aluminum and zirconium.
Claim 12
Dependent Claim
17 words
A sealing material in accordance with claim 10 wherein one of the crystalline materials is magnesium pyrophosphate.
Claim 13
Dependent Claim
44 words
A sealing material in accordance with claim 10 wherein the selected mill addition is a crystallized phosphate glass composed essentially of P 2 O 5 and one or more cations selected from the group composed of magnesium, cobalt, arsenic, zinc, iron, aluminum and zirconium.
Claim 14
Dependent Claim
34 words
A sealing material in accordance with claim 12 wherein the mill addition is a crystallized glass composed essentially of MgO and P 2 O 5 in about the stoichiometric molar ratio of magnesium pyrophosphate.
Claim 15
Dependent Claim
60 words
A sealing material in accordance with claim 13 wherein the crystallized glass composition further includes at least one oxide selected from the group composed of cobalt, arsenic, zinc, aluminum, iron and zirconium, and the molar ratio of the total of such selected oxide(s) plus MgO to the P 2 O 5 is about the stoichiometric molar ratio of magnesium pyrophosphate.
Claim 16
Dependent Claim
15 words
A sealing material in accordance with claim 14 wherein the selected oxide is cobalt oxide.
Claim 17
Dependent Claim
15 words
A sealing material in accordance with claim 14 wherein the selected oxide is zinc oxide.
Claim 18
Dependent Claim
16 words
A sealing material in accordance with claim 1 wherein the sealing material additionally contains Invar particles.
Claim 19
Dependent Claim
23 words
A sealing material in accordance with claim 1 wherein the mill addition constitutes not more than about 20% by volume of the material.
Claim 20
Dependent Claim
93 words
A fusion seal composed of a fused mixture comprising a lead sealing glass and, dispersed therein, a mill addition of a crystalline material selected from the group composed of magnesium pyrophosphate, a magnesium pyrophosphate with at least a portion of the magnesium ions replaced by at least one cation selected from the group composed of cobalt, arsenic, zinc, iron, aluminum and zirconium and a crystallized phosphate glass composed essentially of P 2 O 5 and one or more cations selected from the group composed of magnesium, cobalt, arsenic, zinc, iron, aluminum and zirconium.
Claim 21
Dependent Claim
93 words
A fusion seal composed of a fused mixture comprising a lead sealing glass and, dispersed therein, a mill addition of a crystalline material selected from the group composed of magnesium pyrophosphate, a magnesium pyrophosphate with at least a portion of the magnesium ions replaced by at least one cation selected from the group composed of cobalt, arsenic, zinc, iron, aluminum and zirconium and a crystallized phosphate glass composed essentially of P 2 O 5 and one or more cations selected from the group composed of magnesium, cobalt, arsenic, zinc, iron, aluminum and zirconium.
Claim 22
Dependent Claim
18 words
A fusion seal in accordance with claim 19 wherein the lead sealing glass is a lead borate glass.
Claim 23
Dependent Claim
19 words
A fusion seal in accordance with claim 20 wherein the lead sealing glass is a lead zinc borate glass.
Claim 24
Dependent Claim
17 words
A fusion seal in accordance with claim 19 wherein the lead sealing glass is a lead borosilicate.
Claim 25
Dependent Claim
18 words
A fusion seal in acordance with claim 19 wherein the lead sealing glass is a lead titanate glass.
Claim 26
Dependent Claim
15 words
A fusion seal in accordance with claim 19 wherein the mill addition is magnesium pyrophosphate.
Claim 27
Dependent Claim
41 words
A fusion seal in accordance with claim 19 wherein the mill addition is magnesium pyrophosphate with a portion of the magnesium cations replaced by at least one cation selected from the group composed of cobalt, arsenic, zinc, iron, aluminum, and zirconium.
Claim 28
Dependent Claim
18 words
A fusion seal in accordance with claim 25 wherein the replacing cation in the magnesium pyrophosphate is cobalt.
Claim 29
Dependent Claim
18 words
A fusion seal in accordance with claim 25 wherein the replacing cation in the magnesium pyrophosphate is zinc.
Claim 30
Dependent Claim
60 words
A fusion seal in accordance with claim 19 wherein the selected mill addition is composed of at least two different pyrophosphate crystalline materials with at least one being a magnesium pyrophosphate with at least a portion of the magnesium cations being replaced by at least one cation selected from the group composed of cobalt, arsenic, zinc, iron, aluminum and zirconium.
Claim 31
Dependent Claim
17 words
A fusion seal in accordance with claim 28 wherein one of the crystalline material is magnesium pyrophosphate.
Claim 32
Dependent Claim
44 words
A fusion seal in accordance with claim 19 wherein the selected mill addition is a crystallized phosphate glass composed essentially of P 2 O 5 and one or more cations selected from the group composed of magnesium, cobalt, arsenic, zinc, iron, aluminum and zirconium.
Claim 33
Dependent Claim
34 words
A fusion seal in accordance with claim 30 wherein the mill addition is a crystallized glass composed essentially of MgO and P 2 O 5 in about the stoichiometric molar ratio of magnesium pyrophosphate.
Claim 34
Dependent Claim
60 words
A fusion seal in accordance with claim 31 wherein the crystallized glass composition further includes at least one oxide selected from the group composed of cobalt, arsenic, zinc, aluminum, iron and zirconium, and the molar ratio of the total of such selected oxide(s) plus MgO to the P 2 O 5 is about the stoichiometric molar ratio of magnesium pyrophosphate.
Claim 35
Dependent Claim
15 words
A fusion seal in accordance with claim 32 wherein the selected oxide is cobalt oxide.
Claim 36
Dependent Claim
15 words
A fusion seal in accordance with claim 32 wherein the selected oxide is zinc oxide.
Claim 37
Dependent Claim
15 words
A fusion seal in accordance with claim 19 wherein the seal additionally contains Invar particles.
Claim 38
Dependent Claim
23 words
A fusion seal in accordance with claim 19 wherein the mill addition constitutes not more than about 20% by volume of the material.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-02-17 | 1995-08-19 | 1996-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-17 | 1999-08-19 | 2000-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-17 | 2003-08-19 | 2004-02-18 | $7700.00 | Window Closed / Lapsed |