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US5304516A
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Glaze compositions
Assignee: COOKSON CERAMICS & MINERALS Ltd
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Filing: 1992-04-16
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Granted: 1994-04-19
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Expires: 2012-04-16
Abstract
Abstract Glaze composition comprises 45 to 75% of SioO 2 , 0.1 to below 5% of Bi 2 O 3 , 0.1 to 20% of Al 2 O 3 to 20% of B 2 O 3 , at least one of CaO, MgO, SrO, BaO or Zno in an amount of 2 to 22%, at least one of Li 2 O, Na 2 O, K 2 O in an amount of 1 to 10%, at least one of La 2 O 3 , MoO 3 or WO 3 in an amount of 0.1 to 10% and certain other optional ingredients, all percentages being percentages by weight based on the total weight of the glaze composition, the glaze composition having a firing temperature of 950° to 1250° C., and having a coefficient of thermal expansion of 50 to 100×10 -7 /°C.
Inventors
- 👤 John F. Clifford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:16
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/02; C03C8/04; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; C03C3/093; C03C3/095; C03C8/14
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
199 words
A glaze composition which is essentially free from lead and cadmium and which consists essentially of the following components: ______________________________________
SiO.sub.2 45 to 75%
Bi.sub.2 O.sub.3 0.1 to below 5%
Al.sub.2 O.sub.3 0.1 to 20%
B.sub.2 O.sub.3 2 to 20%
at least one of 2 to 22%
CaO, MgO, SrO, BaO or ZnO
at least one of 1 to 10%
Li.sub.2 O.sub.3, Na.sub.2 O, K.sub.2 O
at least one of 0.1 to 10%
La.sub.2 O.sub.3, MoO.sub.3, WO.sub.3
TiO.sub.2 0 to 10%
ZrO.sub.2 0 to 10%
P.sub.2 O.sub.5 0 to 5%
V.sub.2 O.sub.5 0 to 1%
______________________________________ all percentages being percentages by weight based on the total weight of the glaze composition, the glaze composition containing La 2 O 3 , MoO 3 and/or WO 3 in a total amount of up to 10% by weight, with the proviso that the amount of each of WO 3 and MoO 3 is less than 5% by weight, and with the proviso that BaO is not contained in an amount of more than 2% by weight, the glaze composition having a firing temperature of 950° C. to 1250° C., and having a coefficient of thermal expansion of 50 to 100×10 -7 °C.
Claim 2
Dependent Claim
199 words
A glaze composition which is essentially free from lead and cadmium and which consists essentially of the following components: ______________________________________
SiO.sub.2 45 to 75%
Bi.sub.2 O.sub.3 0.1 to below 5%
Al.sub.2 O.sub.3 0.1 to 20%
B.sub.2 O.sub.3 2 to 20%
at least one of 2 to 22%
CaO, MgO, SrO, BaO or ZnO
at least one of 1 to 10%
Li.sub.2 O.sub.3, Na.sub.2 O, K.sub.2 O
at least one of 0.1 to 10%
La.sub.2 O.sub.3, MoO.sub.3, WO.sub.3
TiO.sub.2 0 to 10%
ZrO.sub.2 0 to 10%
P.sub.2 O.sub.5 0 to 5%
V.sub.2 O.sub.5 0 to 1%
______________________________________ all percentages being percentages by weight based on the total weight of the glaze composition, the glaze composition containing La 2 O 3 , MoO 3 and/or WO 3 in a total amount of up to 10% by weight, with the proviso that the amount of each of WO 3 and MoO 3 is less than 5% by weight, and with the proviso that BaO is not contained in an amount of more than 2% by weight, the glaze composition having a firing temperature of 950° C. to 1250° C., and having a coefficient of thermal expansion of 50 to 100×10 -7 °C.
Claim 3
Dependent Claim
20 words
Glaze composition according to claim 1 which comprises from 1.0 to 4.5% by weight of Bi 2 O 3 .
Claim 4
Dependent Claim
18 words
Glaze composition according to claim 1 which comprises from 50 to 65% by weight of SiO 2 .
Claim 5
Dependent Claim
20 words
Glaze composition according to claim 1 which comprises from 7 to 15% by weight of Al 2 O 3 .
Claim 6
Dependent Claim
16 words
Glaze composition according to claim 1 which comprises 0.1 to 2% by weight MoO 3 .
Claim 7
Dependent Claim
17 words
Glaze composition according to claim 1 which comprises 0.1 to 2% by weight Of WO 3 .
Claim 8
Dependent Claim
19 words
Glaze composition according to claim 1 which comprises 0.1 to 5% by weight of La 2 O 3 .
Claim 9
Dependent Claim
32 words
Glaze composition according to claim 1 which contains a total amount of La 2 O 3 , MoO 3 and WO 3 in the range of from 0.1 to 8.0% by weight.
Claim 10
Dependent Claim
20 words
Glaze composition according to claim 1 which comprises from 5 to 14% by weight of B 2 O 3 .
Claim 11
Dependent Claim
15 words
Glaze composition according to claim 1 which has a refractive index of at least 1.45.
Claim 12
Dependent Claim
11 words
Glaze as claimed in claim 1 which additionally contains a pigment.
Claim 13
Dependent Claim
37 words
A method of glazing a ceramic body, which method comprises coating a ceramic body with a glaze composition according to claim 1 and firing the coated ceramic body at a glazing temperature of 950° to 1250° C.
Claim 14
Dependent Claim
28 words
Method according to claim 13 wherein the ceramic body is selected from the group consisting of ceramic table and whiteware including bone china, fine china, vitreous and earthenware.
Claim 15
Dependent Claim
23 words
Method according to claim 13 wherein the ceramic body is coated by a method selected from the group consisting of dipping and spraying.
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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) | 1997-04-18 | 1997-10-18 | 1998-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-18 | 2001-10-18 | 2002-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-18 | 2005-10-18 | 2006-04-19 | $7700.00 | Window Closed / Lapsed |