VITRKOUS ENAMELING 11 



Kralapp, E. Furnaces for the preparation of fritted enamels. Keram. 

 Rundschau, 20, 261-3; C. A., 6, 3505. 



Kretzer, H. Process for the manufacture of clouded glasses, enamels, and 

 similar products and of clouding agents allowing the carrying out of 

 this process. French Patent 444,440, May 30, 1912. English Patent 

 12,749, May 30, 1912. /. Soc. Chem. Ind., 31, 1129. 



Landau, Kreidl, Heller and Co. Clouding agent for white enamel. English 

 Patent 11,754, May 17, 1912. C. A., 7, 3649. 



Landau, Kreidl, Heller and Co. Alkali containing clouding agent for white 

 enamels. German Patent 283,792, Aug. 24, 1912. C. A., 10, 262. 

 Metal compounds, other than those of tin, are used. 



Landau, Kreidl, Heller and Co. Clouding agents for white enamels. English 

 Patent 16,787, July 18, 1912. C. A., 8, 410. Zircon is partially dis- 

 integrated by heating with sodium hydroxide or carbonate and the 

 soluble silicates and surplus alkali removed with water. The combined 

 alkali is partly removed by treating the mass with ammonium or metallic 

 salts and the product then heated until the water of hydration is removed. 



Landau, Kreidl, Heller and Co. Clouding white enamels. English Patent 

 19,849, Aug. 30, 1912. C. A., 8, 562. 



Landau, Kreidl, Heller and Co. Iron enamels. German Patent 282,348, 

 Aug. 10, 1912. C. A., 9, 2301. Method of directly enameling iron in 

 white. 



Landau, Kreidl, Heller and Co. Manufacture of white enamels. French 

 Patent 429,665. First addition. June 6, 1912. /. Soc. Chem. Ind., 31, 

 1181. See English Patent 6,787. 



Landau, Kreidl, Heller and Co. Opaquing agents for white enamels. English 

 Patent 1,136, Jan, 15, 1912. C. A ., 7, 2460. 



Landau, Kreidl, Heller and Co. White enamels. Swiss Patent 62,594, 

 July 8, 1912. C. A ., 8, 2236. Alkali containing hydroxides of the known 

 metal compounds, used heretofore as obscuring agents, are here employed 

 for that purpose. 



Landau, Kreidl, Heller and Co. White enamels. English Patent 29,382, 

 Dec. 20, 1912. C. A., 8, 2046. The amount of water of hydration con- 

 tained in the hydrated oxide used as the opaquing agent is varied in in- 

 verse proportion to the per cent of alkali used. 



Landau, Kreidl, Heller and Co. White enamel. French Patent 438,908, 

 Jan. 11, 1912. First addition, Jan. 18, 1912. French Patent 450,228, 

 Sept. 7, 1912. English Patent 29,382, Dec. 20, 1912. C. A., 7, 3210; 



/. Soc. Chem. Ind., 31, 643; 32, 489, 753. Compare the above patents by the 

 same firm. 



Landnim, R. D. A comparison of ten white enamels for sheet steel. Trans. 

 Amer. Ceram. Soc , 14, 489-509 (1912) C. A., 7, 230; /. Soc. Chem. Ind., 

 31, 1129. 



Landrum, R. D. Enamels for sheet steel. J. Ind. Eng. Chem., 4, 561-4 

 (1912); Chem. Eng., 16, 141-3 (1912). 



