US4710479A
Expired / Lapsed
US
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Sealing glass composition with lead calcium titanate filler
Assignee: Nippon Electric Glass Co Ltd
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Filing: 1987-04-09
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Granted: 1987-12-01
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Expires: 2007-04-09
Abstract
Abstract A sealing glass composition suitable for sealing members in semiconductor devices at a temperature below about 450 DEG C. for a short time and a comparatively low thermal expansion coefficient of about 33-48x10-7/ DEG C. matching with semiconductors. The sealing glass composition comprises 50-80 vol % solder glass powder and 20-50 vol % filler powder of lead calcium titanate represented by (Pb1-mCam)TiO3 where 0<m</=0.4.
Inventors
- 👤 Toshio Yamanaka
- 👤 Fumio Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:11
CPC Classifications
H; H10; H10W; H10W76/00; H10W76/60; C; C03; C03C; C03C8/00; C03C8/24; C03C8/245; H10W74/00; H10W74/40; C03C2214/00; C03C2214/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
50 words
In a sealing glass composition, as used for sealing members in electronic parts, comprising solder glass powder of a low melting temperature and low expansion coefficient filler powder, the improvement wherein said filler consists essentially of a lead calcium titanate represented by the following chemical formula; (Pb.sub.1-m Ca.sub.m)TiO.sub.3 where 0<m≦0.40.
Claim 2
Dependent Claim
50 words
In a sealing glass composition, as used for sealing members in electronic parts, comprising solder glass powder of a low melting temperature and low expansion coefficient filler powder, the improvement wherein said filler consists essentially of a lead calcium titanate represented by the following chemical formula; (Pb.sub.1-m Ca.sub.m)TiO.sub.3 where 0<m≦0.40.
Claim 3
Dependent Claim
23 words
A sealing glass composition as claimed in claim 1, wherein said filler is 20-50 vol % of the total amount of said composition.
Claim 4
Dependent Claim
24 words
A sealing glass composition as claimed in claim 1, wherein said filler powder has an average particle size of about 15 μm or less.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-30 | 1991-06-01 | 1991-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-30 | 1995-06-01 | 1995-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-30 | 1999-06-01 | 1999-12-01 | $7700.00 | Window Closed / Lapsed |