Patent US4634634A successfully refreshed from Google Patents.
US4634634A
Expired / Lapsed
US
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Glaze ceramic base
Assignee: Niterra Co Ltd
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Filing: 1985-12-24
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Granted: 1987-01-06
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Expires: 2005-12-24
Abstract
Abstract A glazed ceramic base is disclosed comprising a ceramic base having provided and calcined thereon a glaze composition comprising from 56 to 71 mol % SiO 2 , 15.5 to 28 mol % BaO, and 6 to 16 mol % Al 2 O 3 as necessary ingredients, and one or more members of up to 10 mol % SrO, up to 8 mol % B 2 O 3 , up to 10 mol % CaO, and up to 3 mol % MgO as a first group of auxiliary ingredients, with the combined content of the first group of auxiliary ingredients being not more than 10 mol % of the total content. This glaze composition may comprise a second group of auxiliary ingredients.
Inventors
- 👤 Kazuo Kondo
- 👤 Masahiko Okuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:19
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/02; Y; Y10; Y10S; Y10S428/00; Y10S428/901
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
101 words
A glazed ceramic base comprising a ceramic base having provided and calcined thereon a glaze composition comprising from 56 to 71 mol% SiO 2 , 15.5 to 28 mol% BaO, and 6 to 16 mol% Al 2 O 3 as necessary ingredients, and one or more members of up to 10 mol% SrO, up to 8 mol% B 2 O 3 , up to 10 mol% CaO, and up to 3 mol% MgO as a first group of auxiliary ingredients, with the combined content of the first group of auxiliary ingredients being not more than 10 mol% of the total content.
Claim 2
Dependent Claim
101 words
A glazed ceramic base comprising a ceramic base having provided and calcined thereon a glaze composition comprising from 56 to 71 mol% SiO 2 , 15.5 to 28 mol% BaO, and 6 to 16 mol% Al 2 O 3 as necessary ingredients, and one or more members of up to 10 mol% SrO, up to 8 mol% B 2 O 3 , up to 10 mol% CaO, and up to 3 mol% MgO as a first group of auxiliary ingredients, with the combined content of the first group of auxiliary ingredients being not more than 10 mol% of the total content.
Claim 3
Dependent Claim
19 words
A glazed ceramic base as described in claim 1, wherein the ceramic base is an alumina or beryllia base.
Claim 4
Dependent Claim
186 words
A glazed ceramic base as in claim 1, wherein the glaze composition comprises 56 to 71 mol% SiO 2 , 15.5 to 28 mol% BaO and 6 to 16 mol% Al 2 O 3 as necessary ingredients with a content of from 83 to 99.8 mol% of the total content, one or more members selected from up to 10 mol% SrO, up to 8 mol% B 2 O 3 , up to 10 mol% CaO, and up to 3 mol% MgO as a first group of auxiliary ingredients with a content of from 0.1 to 10 mol% of the total content, and one or more members selected from up to 4 mol% Y 2 O 3 , up to 4 mol% La 2 O 3 , up to 6 mol% ZrO 2 , up to 6 mol% TiO 2 , and up to 3 mol% ZnO as a second group of auxiliary ingredients with a content of from 0.1 to 7 mol% of the total content, with the total content of the necessary ingredients and the first and second groups of auxiliary ingredients being 100 mol%.
Claim 5
Dependent Claim
18 words
A glazed ceramic base as in claim 3, wherein the ceramic base is an alumina or beryllia base.
Claim 6
Dependent Claim
53 words
A glazed ceramic base as claimed in claim 1, wherein the Al 2 O 3 and BaO are contained in amounts so that the glaze has good flatness, good heat resistance and good corrosion resistance to HF and HNO 3 , and exhibits low thermal conductivity despite the absence of PbO and alkalis.
Claim 7
Dependent Claim
38 words
A glazed ceramic base as claimed in claim 1, wherein the BaO is contained in amounts which provides low thermal conductivity and the Al 2 O 3 is contained in amounts which prevents crystallization and improves heat resistance.
Claim 8
Dependent Claim
95 words
A glaze composition for the surface of a ceramic base comprising from 56 to 71 mol% SiO 2 , 15.5 to 28 mol% BaO, and 6 to 16 mol% Al 2 O 3 as necessary ingredients, and one or more members of up to 10 mol% SrO, up to 8 mol% B 2 O 3 , up to 10 mol% CaO, and up to 3 mol% MgO as a first group of auxiliary ingredients, with the combined content of the first group of auxiliary ingredients being not more than 10 mol% of the total content.
Claim 9
Dependent Claim
95 words
A glaze composition for the surface of a ceramic base comprising from 56 to 71 mol% SiO 2 , 15.5 to 28 mol% BaO, and 6 to 16 mol% Al 2 O 3 as necessary ingredients, and one or more members of up to 10 mol% SrO, up to 8 mol% B 2 O 3 , up to 10 mol% CaO, and up to 3 mol% MgO as a first group of auxiliary ingredients, with the combined content of the first group of auxiliary ingredients being not more than 10 mol% of the total content.
Claim 10
Dependent Claim
17 words
A glaze composition as in claim 7, wherein the ceramic base is an alumina or beryllia base.
Claim 11
Dependent Claim
184 words
A glaze composition as in claim 7, wherein the composition comprises 56 to 71 mol% SiO 2 , 15.5 to 28 mol% BaO and 6 to 16 mol% Al 2 O 3 as necessary ingredients with a content of from 83 to 99.8 mol% of the total content, one or more members selected from up to 10 mol% SrO, up to 8 mol% B 2 O 3 , up to 10 mol% CaO, and up to 3 mol% MgO as a first group of auxiliary ingredients with a content of from 0.1 to 10 mol% of the total content, and one or more members selected from up to 4 mol% Y 2 O 3 , up to 4 mol% La 2 O 3 , up to 6 mol% ZrO 2 , up to 6 mol% TiO 2 , and up to 3 mol% ZnO as a second group of auxiliary ingredients with a content of from 0.1 to 7 mol% of the total content, with the total content of the necessary ingredients and the first and second groups of auxiliary ingredients being 100 mol%.
Claim 12
Dependent Claim
17 words
A glaze composition as in claim 9, wherein the ceramic base is an alumina or beryllia base.
Claim 13
Dependent Claim
52 words
A glaze composition as claimed in claim 1, wherein the Al 2 O 3 and BaO are contained in amounts so that the glaze has good flatness, good heat resistance and good corrosion resistance to HF and HNO 3 , and has low thermal conductivity despite the absence of PbO and alkalis.
Claim 14
Dependent Claim
39 words
A glaze composition as claimed in claim 5, wherein the BaO is contained in an amount which provides low thermal conductivity and the Al 2 O 3 is contained in an amount which prevents crystallization and improves heat resistance.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |