Claims
- 1. Tile of vitrified stoneware colored in shades from yellow ocher to sienna, obtained starting from ceramic material added with 1% to 10% by wt. of TiO2 and wherein the surface of the molded tile is treated before ceramic firing with an aqueous or hydroalcoholic solution containing W and Cr inorganic compounds or organic derivatives, in such amount that the applied W is from 5 to 100 g/m2 of ceramic surface are the applied Cr is from 0.8 to 30g/m2 and wherein the W and Cr applied on the ceramic surface are in a ratio are in a ratio comprised between 12/1 and 2/1 by w.
- 2. Tile according to claim 1 wherein the surface colored layer has been partially removed by smoothing and final polishing.
- 3. Tile according to claim 1 wherein the surface colored layer has been removed up to 10 μ by smoothing and final polishing.
- 4. Tile according to claim 1 wherein the coloration in shades from yellow ocher to sienna is obtained on a limited portion of the tile surface through application of the coloring composition by the silk-screen technique.
Priority Claims (1)
Number |
Date |
Country |
Kind |
MI97A2874 |
Dec 1997 |
IT |
|
Parent Case Info
This is a divisional of U.S. application Ser. No. 09/217,486 filed Dec. 21, 1998 now U.S. Pat. No. 6,099,633.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4908065 |
Tanitsu et al. |
Mar 1990 |
|
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DE |
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DE |
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DE |
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EP |
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SU |
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WO |
Non-Patent Literature Citations (2)
Entry |
English abstract of Swiss patent 575,894 (May 1976). |
English abstract of Sprechsal, vol. 119, No. 10 (1986) No month provided. |