US5330939A
Expired / Lapsed
US
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Method of preparing vitreous ceramic composition suitable for coating ceramic articles
Assignee: Ceramica Filippo Marazzi SpA
•
Filing: 1993-11-23
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Granted: 1994-07-19
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Expires: 2013-11-23
Abstract
Abstract A vitreous ceramic composition for coating ceramic articles with a zinc and alumina base capable of separating rapidly up to 50% of crystalline phase consisting essentially of gahnite. The percentages by weight of the principal ingredients of the composition are the following. SiO 2 30-50%; Al 2 O 3 10-25%; ZnO 8-25%; B 2 O 3 5-20%; TiO 2 0-7%; other selected oxides can be added to change the fusability characteristics and heat expansion coefficients on the basis of specific applications of the composition.
Inventors
- 👤 Filippo Marazzi
- 👤 Mariano Paganelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:44
CPC Classifications
C; C03; C03C; C03C10/00; C03C8/00; C03C8/02; C03C8/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
91 words
A method of preparing frits, useful in the coating of ceramic pieces, consisting of the steps of: preparing a vitreous ceramic composition by mixing the following ingredients expressed in weight percent to form a mixture thereof: ______________________________________
SiO.sub.2 30-50%
Al.sub.2 O.sub.3 10-25%
ZnO 8-25%
B.sub.2 O.sub.3 5-20%; and
TiO.sub.2 0-7%;
______________________________________ heating said mixture to a temperature at least sufficient for melting said composition to produce a vitreous mass which will separate rapidly up to 50% of the crystalline phase made up essentially of gahnite; and suddenly cooling said vitreous mass.
Claim 2
Independent Claim
91 words
A method of preparing frits, useful in the coating of ceramic pieces, consisting of the steps of: preparing a vitreous ceramic composition by mixing the following ingredients expressed in weight percent to form a mixture thereof: ______________________________________
SiO.sub.2 30-50%
Al.sub.2 O.sub.3 10-25%
ZnO 8-25%
B.sub.2 O.sub.3 5-20%; and
TiO.sub.2 0-7%;
______________________________________ heating said mixture to a temperature at least sufficient for melting said composition to produce a vitreous mass which will separate rapidly up to 50% of the crystalline phase made up essentially of gahnite; and suddenly cooling said vitreous mass.
Claim 3
Dependent Claim
42 words
The method as claimed in claim 1, and further comprising: adding to said mixture forming said vitreous ceramic composition further oxides of elements selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba, Pb and mixtures thereof.
Claim 4
Dependent Claim
47 words
The method as claimed in claim 2, and further comprising: adding said further oxides according to the formula M.sub.2 O where M is an element selected from the group consisting of Li, Na, K, Rb and Cs and does not exceed 8 weight percent of the composition.
Claim 5
Dependent Claim
46 words
The method as claimed in claim 3, and further comprising: adding said further oxides according to the formula MO where M is an element selected from the group consisting of Mg, Ca, Sr, Ba and Pb and does not exceed 5 weight percent of the composition.
Claim 6
Dependent Claim
18 words
The method as claimed in claim 1, wherein said temperature for melting said composition is approximately 1,450° C.
Claim 7
Dependent Claim
18 words
The method as claimed in claim 1, wherein said temperature for melting said composition is approximately 1,450° C.
Claim 8
Dependent Claim
18 words
The method as claimed in claim 3, wherein said temperature for melting said composition is approximately 1,450° C.
Claim 9
Dependent Claim
18 words
The method as claimed in claim 4, wherein said temperature for melting said composition is approximately 1,450° C.
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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) | 1997-07-18 | 1998-01-17 | 1998-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-18 | 2002-01-17 | 2002-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-18 | 2006-01-17 | 2006-07-19 | $7700.00 | Window Closed / Lapsed |