Patent US4767672A successfully refreshed from Google Patents.
US4767672A
Expired / Lapsed
US
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Process for preparation of glazed ceramic substrate and glazing composition used therefor
Assignee: Kyocera Corp
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Filing: 1986-11-03
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Granted: 1988-08-30
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Expires: 2006-11-03
Abstract
Abstract A paste of a glazing composition is coated on the entire surface of a ceramic substrate having a metallized metal portion, and the paste-coated ceramic substrate is sintered in a reducing atmosphere, and a glazing layer is formed on the entire surface of the metallized metal portion by utilizing the repellency of the melt of the glazing composition to the metallized metal portion. A glazing composition comprising SiO2, B2O3, BaO, Al2O3 and an alkali metal oxide or a glazing composition comprising SiO2, BaO, Al2O3, CaO and MgO or SrO is used. An acrylic resin syrup, especially an isobutyl methacrylate resin syrup, is used as a binder of a coating paste for forming a glazing layer.
Inventors
- 👤 Hiroshi Fujinaka
- 👤 Masami Terasawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:22
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/02; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/5022; C04B41/52; C04B41/80; C04B41/81; C04B41/85; C04B41/86; C04B41/89; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; Y; Y10; Y10S; Y10S428/00; Y10S428/901
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
128 words
A glazed ceramic substrate which comprises a ceramic substrate having through holes, a metallized metal portion embedded in said through holes and a glazing layer melt-bonded to the surface of the ceramic substrate exclusive of the metallized metal portion, wherein said glazing layer is formed from a composition consisting of 60 to 80% by weight of SiO 2 , 10 to 25% by weight of B 2 O 3 , 2 to 20% by weight BaO, 0.5 to 10% by weight of Al 2 O 3 and 1 to 15% by weight of an alkali metal oxide, said metallized metal portion being composed of molybdenum or tungsten, and said glazing composition having a repellency to the metallized metal portion when said glazing composition is in a molten state.
Claim 2
Dependent Claim
128 words
A glazed ceramic substrate which comprises a ceramic substrate having through holes, a metallized metal portion embedded in said through holes and a glazing layer melt-bonded to the surface of the ceramic substrate exclusive of the metallized metal portion, wherein said glazing layer is formed from a composition consisting of 60 to 80% by weight of SiO 2 , 10 to 25% by weight of B 2 O 3 , 2 to 20% by weight BaO, 0.5 to 10% by weight of Al 2 O 3 and 1 to 15% by weight of an alkali metal oxide, said metallized metal portion being composed of molybdenum or tungsten, and said glazing composition having a repellency to the metallized metal portion when said glazing composition is in a molten state.
Claim 3
Dependent Claim
128 words
A glazing ceramic substrate which comprises a ceramic substrate having through holes, a metallized metal portion embedded in said through holes and a glazing layer melt-bonded to the surface of the ceramic substrate exclusive of the metallized metal portion, wherein said glazing layer is formed from a composition consisting of 61 to 80% by weight of SiO 2 , 10 to 25% by weight of B 2 O 3 , 2 to 9% by weight BaO, 0.5 to 10% by weight of Al 2 O 3 and 1 to 15% by weight of an alkali metal oxide, said metallized metal portion being composed of molybdenum or tungsten, and said glazing composition having a repellency to the metallized metal portion when said glazing composition is in a molten state.
Claim 4
Dependent Claim
128 words
A glazing ceramic substrate which comprises a ceramic substrate having through holes, a metallized metal portion embedded in said through holes and a glazing layer melt-bonded to the surface of the ceramic substrate exclusive of the metallized metal portion, wherein said glazing layer is formed from a composition consisting of 61 to 80% by weight of SiO 2 , 10 to 25% by weight of B 2 O 3 , 2 to 9% by weight BaO, 0.5 to 10% by weight of Al 2 O 3 and 1 to 15% by weight of an alkali metal oxide, said metallized metal portion being composed of molybdenum or tungsten, and said glazing composition having a repellency to the metallized metal portion when said glazing composition is in a molten state.
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) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |