US5284706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing glass composite
Assignee: Olin Corp
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Filing: 1991-12-23
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Granted: 1994-02-08
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Expires: 2011-12-23
Abstract
Abstract There is provided a sealing glass composite which has a desired coefficient of thermal expansion. The composite is made up of a glass matrix having a first coefficient of thermal expansion and a substantially spherical particulate additive with a second coefficient of thermal expansion dispersed within the matrix. Use of a substantially spherical particulate additive having a reduced surface area as compared to other shaped particulate additive minimizes the reaction between the additive and the glass matrix. The spherical particles also provide better flow at high loading factors and improved fracture toughness.
Inventors
- 👤 Brien E. O'Donnelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:59
CPC Classifications
C; C03; C03C; C03C14/00; C03C14/004; C03C8/00; C03C8/24; C03C2214/00; C03C2214/04; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/258; Y10T428/259
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
118 words
A sealing glass composite, comprising a glass matrix having a sealing temperature below about 450° C. and a coefficient of thermal expansion of from about 80×10 -7 in/in/°C. to about 130×10 -7 in/in/°C.; and from 32 to about 85 weight percent based on the total composite of at least one substantially spherical particulate additive dispersed within said glass matrix, said particulate additive selected from the group consisting of calcium fluoride, barium fluoride, coated calcium fluoride, coated barium fluoride and mixtures thereof and having a diameter effective to limit the dissolution of said particulate additive in said glass matrix to less than 10 percent by weight during glass sealing without significantly affecting the flow of said sealing glass composite.
Claim 2
Dependent Claim
118 words
A sealing glass composite, comprising a glass matrix having a sealing temperature below about 450° C. and a coefficient of thermal expansion of from about 80×10 -7 in/in/°C. to about 130×10 -7 in/in/°C.; and from 32 to about 85 weight percent based on the total composite of at least one substantially spherical particulate additive dispersed within said glass matrix, said particulate additive selected from the group consisting of calcium fluoride, barium fluoride, coated calcium fluoride, coated barium fluoride and mixtures thereof and having a diameter effective to limit the dissolution of said particulate additive in said glass matrix to less than 10 percent by weight during glass sealing without significantly affecting the flow of said sealing glass composite.
Claim 3
Dependent Claim
23 words
The glass composite of claim 1 wherein the diameter of said substantially spherical particulate additive is from about 1 to about 100 microns.
Claim 4
Dependent Claim
25 words
The sealing glass composite of claim 2 wherein the diameter of said substantially spherical particulate additive is from about 5 microns to about 40 microns.
Claim 5
Dependent Claim
20 words
The sealing glass composite of claim 2 wherein said substantially spherical particulate additive is present in a bimodal size distribution.
Claim 6
Dependent Claim
20 words
The sealing glass composite of claim 2 wherein said substantially spherical particulate additive is present in a non-uniform size distribution.
Claim 7
Dependent Claim
17 words
The sealing glass composite of claim 2 wherein said substantially spherical particulate additive is uncoated calcium fluoride.
Claim 8
Dependent Claim
27 words
The sealing glass composite of claim 1, wherein said glass matrix is selected from the group consisting of lead borate, lead-zinc borate, lead borosilicate and lead-zinc borosilicate.
Claim 9
Dependent Claim
24 words
The sealing glass composite of claim 7 wherein said substantially spherical particulate additive has a diameter of from about 1 to about 100 microns.
Claim 10
Dependent Claim
23 words
The sealing glass composite of claim 8 wherein said spherical particulate additive has a diameter of from about 5 to about 40 microns.
Claim 11
Dependent Claim
17 words
The sealing glass composite of claim 9 wherein said substantially spherical particulate additive is uncoated calcium fluoride.
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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) | 1997-02-07 | 1997-08-09 | 1998-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-07 | 2001-08-09 | 2002-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-07 | 2005-08-09 | 2006-02-08 | $7700.00 | Window Closed / Lapsed |