US PATENT SUBCLASS 210 / 687
.~.~.~ Calcium or magnesium (e.g., hardness, water softening, etc.)

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


210 /   HD   LIQUID PURIFICATION OR SEPARATION

600  DF  PROCESSES {14}
660  DF  .~ Ion exchange or selective sorption {8}
681  DF  .~.~ Removing ions {4}
687.~.~.~ Calcium or magnesium (e.g., hardness, water softening, etc.)

DEFINITION

Classification: 210/687

Calcium or magnesium (e.g., hardness, water softening, etc.):

(under subclass 681) Process wherein the ion is of a Group IIA element with atomic number 12 or 20.