METHOD FOR MANUFACTURING DIALS FOR WATCHES AND DIALS FOR WATCHES MANUFACTURED ACCORDING TO SAID METHOD

• Main Authors: SIMON VERMOT A,CH, HOFER E,CH
• Format: Patent
• Language: English
• Published: 26.02.1974
• Subjects: APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING ORMAINTAINING CLOCKS OR WATCHES; HOROLOGY; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; MECHANICALLY-DRIVEN CLOCKS OR WATCHES; PHYSICS; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS

A glass watch dial is formed from a moldable glass batch comprising a mixture of glass-forming oxides, intermediate oxides, network-modifying oxides, and a devitrifying agent such as a metal oxide or a metal in colloidal dispersion, which is melted, and to which then is added a metal oxide capable of forming colored crystal nuclei of a synthetic mineral in the presence of the devitrifying agent, then the mass is cooled, the batch is molded to a dial and held at elevated temperature above its annealing point to permit the growth of crystallites from various minerals into the glass matrix to form a mineral similar in aspect, chemical composition and crystal structure to a semiprecious stone.