US4396682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glazed ceramic substrate
Assignee: Central Glass Co Ltd
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Filing: 1981-12-22
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Granted: 1983-08-02
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Expires: 2001-12-22
Abstract
Abstract A glazed ceramic substrate for use in electric or electronic devices, obtained by forming a glass coating layer directly on a major surface of a ceramic substrate such as an alumina substrate. The glass as the material of the coating layer contains 50-60 Wt % of SiO 2 , 10-30 Wt % of Al 2 O 3 , 15-30 Wt % of CaO and MgO, and 2-6 Wt % of ZrO 2 as essential components, optionally with the addition of small amount(s) of at least one of TiO 2 , BaO, ZnO, PbO, P 2 O 5 , B 2 O 3 , Na 2 O and K 2 O. The coating layer formed of this glass is excellent in its high-temperature stability, so that the glazed ceramic substrate is particularly suitable for use in thermal heads of thermal printing devices.
Inventors
- 👤 Yoshio Mohri
- 👤 Tsutomu Ikeda
- 👤 Takashi Hiroishi
- 👤 Kinzi Sano
- 👤 Yasuhiro Yamamoto
- 👤 Yuji Yamamoto
- 👤 Ryoji Nakashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:09
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/02; C03C8/10; C03C8/12; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087; C03C8/08; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
A glazed ceramic substrate comprising: a plate-shaped body of a ceramic material; and a glass coating layer formed directly on a major surface of said body, the glass which constitutes said coating layer comprising 50 to 60% by weight of SiO 2 , 10 to 30% by weight of Al 2 O 3 , 15 to 30% by weight of CaO and MgO which are jointly used, and 2 to 6% by weight of ZrO 2 as essential components thereof.
Claim 2
Dependent Claim
80 words
A glazed ceramic substrate comprising: a plate-shaped body of a ceramic material; and a glass coating layer formed directly on a major surface of said body, the glass which constitutes said coating layer comprising 50 to 60% by weight of SiO 2 , 10 to 30% by weight of Al 2 O 3 , 15 to 30% by weight of CaO and MgO which are jointly used, and 2 to 6% by weight of ZrO 2 as essential components thereof.
Claim 3
Dependent Claim
47 words
A glazed ceramic substrate according to claim 1, wherein said glass further comprises at least one auxiliary component selected from the group consisting of TiO 2 , BaO, ZnO, PbO, P 2 O 5 , B 2 O 3 , Na 2 O and K 2 O.
Claim 4
Dependent Claim
29 words
A glazed ceramic substrate according to claim 2, wherein the total content of said at least one auxiliary component in said glass is not greater than 10% by weight.
Claim 5
Dependent Claim
31 words
A glazed ceramic substrate according to claim 3, wherein the total content of said Na 2 O and K 2 O in said glass is not greater than 4% by weight.
Claim 6
Dependent Claim
31 words
A glazed ceramic substrate according to claim 1 or 2, wherein the content of Al 2 O 3 in said glass is in the range from 10 to 20% by weight.
Claim 7
Dependent Claim
26 words
A glazed ceramic substrate according to claim 1, wherein said ceramic material is selected from the group consisting of alumina, beryllia, magnesia, steatite, forsterite and zirconia.
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) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |