C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
C03B5/02—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating
C03B5/027—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating by passing an electric current between electrodes immersed in the glass bath, i.e. by direct resistance heating