Method of polishing crystal glass and lead crystal glass articles

Claim 1

A METHOD OF POLISHING GLASS ARTICLES, MADE IN PARTICULAR OF CRYSTAL GLASS, COMPRISING THE STEPS OF PACKING THE GLASS ARTICLES INTO A WIDE-MESHED CONTAINER, IMMERSING AND MOVING THE CONTAINER FILLED WITH THE ARTICLES TO TO POLISHED IN A VESSEL CONTAINING A POLISHING BATH UNTIL A DEPOSIT OF SALT-LIKE REACTION PRODUCTS HAS BEEN FORMED ON THE SURFACES OF THE ARTICLES TO BE POLISHED, THE POLISHING BATH CONSISTING OF A SOLUTION OF SULPHURIC ACID OF A CONCENTRATION OF FROM 520% TO 60% BY WEIGHT WHICH CONTAINS HYDROFLUORIC ACID IN AN AMOUNT OF FROM 5 TO 10% BY WEIGHT AND IS MAINTAINED AT A TEMPERATURE IN THE RANGE BETWEEN 40* AND 60*C. THEREAFTER REMOVING THE CONTAINER WITH THE ARTICLES TO BE POLISHED FROM THE POLISHING BATH AS SOON AS SAID ARTICLES HAVE BEEN COATED WITH A SALT DEPOSIT ON THEIR SURFACES, IMMERSING AND MOVING SAID CONTAINER IN A VESSEL CONTAINING A SALT REMOVING BATH UNTIL THE SALT DEPOSIT HAS SEPARATED FROM THE SURFACES OF THE ARTICLES, SAID SALT REMOVING BATH CONSISTING OF A SOLUTION OF SULPHURIC ACID OF A CONCENTRATION OF AT LEAST 66% BY WEIGHT WHICH IS MAINTAINED AT A TEMPERATURE OF AT LEAST 60*C., WHEREBY THE SALT REMOVING BATH IS MAINTAINED AT A TEMPERATURE IN A RANGE ABOUT 10 TO 20*C. HIGHER THAN THE TEMPERATURE OF THE POLISHING BATH, REMOVING THE CONTAINER WITH THE ARTICLES TO BE POLISHED FROM THE SALT REMOVING BATH AS SOON AS SAID ARTICLES HAVE BEEN FREED OF THE SALT DEPOSIT, AND REPEATING THE ALTERNATING TREATMENT IN THE POLISHING BATH AND IN THE SALT REMOVING BATH UNTIL THE DESIRED POLISH HAS BEEN OBTAINED, WHEREUPON THE FINALLY POLISHED ARTICLES CONTAINED IN THE WIDE-MESHED CONTAINER ARE WASHED WITH WATER AFTER THE FINAL TREATMENT IN THE SALT REMOVING BATH AND DRIED.

Claim 2

A METHOD OF POLISHING GLASS ARTICLES, MADE IN PARTICULAR OF CRYSTAL GLASS, COMPRISING THE STEPS OF PACKING THE GLASS ARTICLES INTO A WIDE-MESHED CONTAINER, IMMERSING AND MOVING THE CONTAINER FILLED WITH THE ARTICLES TO TO POLISHED IN A VESSEL CONTAINING A POLISHING BATH UNTIL A DEPOSIT OF SALT-LIKE REACTION PRODUCTS HAS BEEN FORMED ON THE SURFACES OF THE ARTICLES TO BE POLISHED, THE POLISHING BATH CONSISTING OF A SOLUTION OF SULPHURIC ACID OF A CONCENTRATION OF FROM 520% TO 60% BY WEIGHT WHICH CONTAINS HYDROFLUORIC ACID IN AN AMOUNT OF FROM 5 TO 10% BY WEIGHT AND IS MAINTAINED AT A TEMPERATURE IN THE RANGE BETWEEN 40* AND 60*C. THEREAFTER REMOVING THE CONTAINER WITH THE ARTICLES TO BE POLISHED FROM THE POLISHING BATH AS SOON AS SAID ARTICLES HAVE BEEN COATED WITH A SALT DEPOSIT ON THEIR SURFACES, IMMERSING AND MOVING SAID CONTAINER IN A VESSEL CONTAINING A SALT REMOVING BATH UNTIL THE SALT DEPOSIT HAS SEPARATED FROM THE SURFACES OF THE ARTICLES, SAID SALT REMOVING BATH CONSISTING OF A SOLUTION OF SULPHURIC ACID OF A CONCENTRATION OF AT LEAST 66% BY WEIGHT WHICH IS MAINTAINED AT A TEMPERATURE OF AT LEAST 60*C., WHEREBY THE SALT REMOVING BATH IS MAINTAINED AT A TEMPERATURE IN A RANGE ABOUT 10 TO 20*C. HIGHER THAN THE TEMPERATURE OF THE POLISHING BATH, REMOVING THE CONTAINER WITH THE ARTICLES TO BE POLISHED FROM THE SALT REMOVING BATH AS SOON AS SAID ARTICLES HAVE BEEN FREED OF THE SALT DEPOSIT, AND REPEATING THE ALTERNATING TREATMENT IN THE POLISHING BATH AND IN THE SALT REMOVING BATH UNTIL THE DESIRED POLISH HAS BEEN OBTAINED, WHEREUPON THE FINALLY POLISHED ARTICLES CONTAINED IN THE WIDE-MESHED CONTAINER ARE WASHED WITH WATER AFTER THE FINAL TREATMENT IN THE SALT REMOVING BATH AND DRIED.