US4806334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glazed ceramic substrate
Assignee: Kyocera Corp
•
Filing: 1987-10-26
•
Granted: 1989-02-21
•
Expires: 2007-10-26
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 21:20
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C03; C03C; C03C8/00; C03C8/02; 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; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12597; Y10T428/12604; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/1284; Y10T428/24; Y10T428/24273; Y10T428/24802; Y10T428/24926
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
194 words
A glazed ceramic substrate for electrical wiring, comprising: a ceramic substrate having holes formed therethrough; a metal composition embedded in the holes of the ceramic substrate, the metal composition providing an electrical connection to the electrical wiring; and a glazing layer melt-bonded to a surface of the ceramic substrate exclusive of the metal composition, the glazing layer providing a surface on which the electrical wiring may be formed, the glazing being repellent to the metal composition when the glazing layer is melted, wherein the glazing layer is formed from a composition consisting essentially of 55 to 75% by weight of SiO 2 , 6 to 20% by weight of BaO, 6 to 12% by weight of Al 2 O 3 , 8 to 20% by weight of CaO and 0.05 to 3% by weight of at least one oxide selected from the group consisting of MgO and SrO, said glazing layer composition is coated over the surface of said ceramic substrate inclusive of said metal composition, and said glazing layer composition is then melted under a reducing atmosphere, whereby said glazing layer is melt-bonded to said ceramic substrate but repelled from said metal composition.
Claim 2
Dependent Claim
194 words
A glazed ceramic substrate for electrical wiring, comprising: a ceramic substrate having holes formed therethrough; a metal composition embedded in the holes of the ceramic substrate, the metal composition providing an electrical connection to the electrical wiring; and a glazing layer melt-bonded to a surface of the ceramic substrate exclusive of the metal composition, the glazing layer providing a surface on which the electrical wiring may be formed, the glazing being repellent to the metal composition when the glazing layer is melted, wherein the glazing layer is formed from a composition consisting essentially of 55 to 75% by weight of SiO 2 , 6 to 20% by weight of BaO, 6 to 12% by weight of Al 2 O 3 , 8 to 20% by weight of CaO and 0.05 to 3% by weight of at least one oxide selected from the group consisting of MgO and SrO, said glazing layer composition is coated over the surface of said ceramic substrate inclusive of said metal composition, and said glazing layer composition is then melted under a reducing atmosphere, whereby said glazing layer is melt-bonded to said ceramic substrate but repelled from said metal composition.
Claim 3
Dependent Claim
19 words
A substrate according to claim 1, wherein the glazing layer has an average thickness of 10 to 150 microns.
Claim 4
Dependent Claim
14 words
A substrate according to claim 1, wherein said metal composition comprises molybdenum or tungsten.
Claim 5
Dependent Claim
36 words
A substrate according to claim 3, wherein a layer comprising at least one metal selected from the group consisting of nickel, gold, platinum, palladium and rhodium is provided on a surface of said molybdenum or tungsten.
References Cited (Backward Citations)
US4012263A
Cited
US4180618A
Cited
US4282507A
Cited
US4238705A
Cited
US4396682A
Cited
US4536435A
Cited
US4634634A
Cited
US4429007A
Cited
US4598167A
Cited
US4650923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |