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US4352889A
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Tin oxide, titanium oxide and/or zirconium oxide coated β-eucryptite particles having a negative coefficient of linear thermal expansion and sealing compositions containing said particles
Assignee: Niterra Co Ltd
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Filing: 1981-09-14
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Granted: 1982-10-05
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Expires: 2001-09-14
Abstract
Abstract A powder having a negative coefficient of linear thermal expansion and sealing compositions containing the same are disclosed wherein the powder is a beta -eucryptite particle having on the surface thereof a layer of tin oxide, titanium oxide, and/or zirconium oxide.
Inventors
- 👤 Akio Takami
- 👤 Kazuo Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:37
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/24; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
77 words
A sealing composition having low expansivity which consists essentially of up to about 30% by weight of β-eucryptite particles and a lead borate glass, said β-eucryptite particles having on the surface thereof a single layer of or multiple layers of a member selected from the group consisting of tin oxide, titanium oxide, zirconium oxide and a mixture of two or more of said oxides, said oxides being present in a thickness of about 1 micron or less.
Claim 2
Dependent Claim
77 words
A sealing composition having low expansivity which consists essentially of up to about 30% by weight of β-eucryptite particles and a lead borate glass, said β-eucryptite particles having on the surface thereof a single layer of or multiple layers of a member selected from the group consisting of tin oxide, titanium oxide, zirconium oxide and a mixture of two or more of said oxides, said oxides being present in a thickness of about 1 micron or less.
Claim 3
Dependent Claim
29 words
The sealing composition of claim 1, wherein said glass has a coefficient of linear expansion of about 80×10 -7 to 130×10 -7 °C. -1 at 30° to 250° C.
Claim 4
Dependent Claim
20 words
The sealing composition of claim 2, wherein said glass has a glass transition point of about 250° to 400° C.
Claim 5
Dependent Claim
32 words
The sealing composition of claims 1 or 3, wherein said glass contains a combination of PbO and B 2 O 3 in a total amount of at least about 70% by weight.
Claim 6
Dependent Claim
50 words
The sealing composition of claim 1, wherein said glass comprises about 75 to 82 wt% PbO, about 6.5 to 12 wt% B 2 O 3 , about 7 to 14 wt% ZnO, about 1.5 to 3 wt% SiO 2 and about 0 to 3 wt% Al 2 O 3 .
Claim 7
Dependent Claim
12 words
The sealing composition of claim 1, wherein said oxide is tin oxide.
Claim 8
Dependent Claim
12 words
The sealing composition of claim 1, wherein said oxide is titanium oxide.
Claim 9
Dependent Claim
12 words
The sealing composition of claim 1, wherein said oxide is zirconium oxide.
References Cited (Backward Citations)
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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) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |