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US4959330A
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Crystallizable glass and thick film compositions thereof
Assignee: EIDP Inc
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Filing: 1989-11-17
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Granted: 1990-09-25
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Expires: 2009-11-17
Abstract
Abstract A dielectric glass composition consisting essentially on a molar basis of 15-27% ZNO, 8-16% BaO, 40-60% SiO 2 , 3-14% Al 2 O 3 , 0-5% PbO and 0.5-5% of a metal oxide selected from ZrO 2 , up to 2.5% P 2 O 5 and mixtures thereof, the composition being crystallizable and non-reducing when fired at 850°-900° C.
Inventors
- 👤 Paul C. Donohue
- 👤 Kenneth W. Hang
- 👤 Michael J. Haun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:31
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087; C03C10/00; C03C10/0036; C03C3/062; C03C3/102; C03C3/105; C03C4/00; C03C4/16; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
72 words
A dielectric glass composition consisting essentially on a molar basis of 15-27% ZnO, 8-30% alkaline earth metal oxides selected from 7-21% BaO, 0-20% CaO, 0-12% SrO and mixtures thereof, 40-60% SiO 2 , 3-14% Al 2 O 3 , 0-5% PbO and 0.5-5% of an oxide selected from ZrO 2 , 0.5 to 2.5% P 2 O 5 and mixtures thereof, the composition being crystallizable and non-reducing when fired at 850°-900° C.
Claim 2
Dependent Claim
72 words
A dielectric glass composition consisting essentially on a molar basis of 15-27% ZnO, 8-30% alkaline earth metal oxides selected from 7-21% BaO, 0-20% CaO, 0-12% SrO and mixtures thereof, 40-60% SiO 2 , 3-14% Al 2 O 3 , 0-5% PbO and 0.5-5% of an oxide selected from ZrO 2 , 0.5 to 2.5% P 2 O 5 and mixtures thereof, the composition being crystallizable and non-reducing when fired at 850°-900° C.
Claim 3
Dependent Claim
22 words
A thick film encapsulant composition comprising finely divided particles of the glass composition of claim 1 dispersed in a liquid organic medium.
Claim 4
Dependent Claim
65 words
A dielectric film on a substrate formed by (1) applying a layer of the composition of claim 2 to the substrate and (2) heating the layer for 30-60 minutes of which 5-10 minutes is at a peak temperature of 850°-900° C. to effect (a) volatilization of the organic medium and (b) formation of crystals from the dielectric glass which are dispersed in the remainder glass.
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) | 1993-09-24 | 1994-03-26 | 1994-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-24 | 1998-03-26 | 1998-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-24 | 2002-03-26 | 2002-09-25 | $7700.00 | Window Closed / Lapsed |