Methods of growing crystals

Claim 1

A METHOD OF GROWING CRYSTALS OF ANHYDROUS ETHYLENE DIAMINE TARTRATE FROM A SUPERSATURATED AQUEOUS SOLUTION COMPRISING THE FIRST STEP OF IMMERSING SEED CRYSTALS OF ANHYDROUS ETHYLENE DIAMINE TARTRATE IN A BODY OF SUPERSATURATED AQUEOUS SOLUTION AT A TEMPERATURE WITHIN AND NEAR THE UPPER LIMIT OF THE RANGE 40* C. TO 52* C., THE SECOND STEP OF CONTROLLING THE TEMPERATURE OF THE BODY OF SOLUTION SO THAT IT DECREASES GRADUALLY FROM THE SAID TEMPERATURE TO A DIFFERENT TEMPERATURE WITHIN THE SAID RANGE NEAR THE LOWER LIMIT, THE TEMPERATURE BEING CONTROLLED SO THAT THE SOLUTION REMAINS SUPERSATURATED AS CRYSTALLINE ANHYDROUS ETHYLENE DIAMINE TARTRATE IS DEPOSITED ON THE SEED CRYSTALS, THE THIRD STEP OF CONTROLLING THE TEMPERATURE OF THE BODY OF SOLUTION SO THAT IT INCREASES FROM THE SAID DIFFERENT TEMPERATURE TO A TEMPERATURE NEAR THE UPPER LIMIT OF THE SAID RANGE, THE CONCENTRATION OF THE SOLUTION BEING INCREASED DURING THE THIRD STEP TO MAINTAIN IT SUPERSATURATED BY CONNECTING RECHARGING APPARATUS TO THE BODY OF SOLUTION AND CIRCULATING THE SOLUTION THROUGH THE APPARATUS IN WHICH IT PASSES OVER SOLID ETHYLENE DIAMINE TARTRATE AT A TEMPERATURE BETWEEN 3* C. AND 10* C. HIGHER THAN THE SATURATION TEMPERATURE OF THE BODY OF SOLUTION, AND THE FURTHER STEPS OF REPEATING THE SAID SECOND AND THIRD STEPS IN THAT ORDER UNTIL THE CRYSTALS HAVE GROWN TO THE REQUIRED SIZE.