US4634634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glaze ceramic base
Assignee: Niterra Co Ltd
•
Filing: 1985-12-24
•
Granted: 1987-01-06
•
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 00:05
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.
References Cited (Backward Citations)
US3927238A
Cited
US4084976A
Cited
JPS5425381A
Cited
US4120733A
Cited
US4256497A
Cited
US4282035A
Cited
US4340645A
Cited
US4358541A
Cited
US4385127A
Cited
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 |