Patents Assigned to Sor-Van Radiation Ltd.
  • Water softening process
    Patent number: 5152904
    Abstract: Process for softening hard water by precipitation of calcium carbonate. The hard water is rendered alkaline, e.g. by the addition of sodium hydroxide, and is then contacted with a large excess of calcium carbonate crystals whose size does not exceed 100 microns, whereby precipitation occurs within a short contact time of the order of 2-60 seconds. Upon separation of soft water from calcium carbonate the bulk of the latter is recirculated and excessive amounts are removed.
    Type: Grant
    Filed: January 16, 1991
    Date of Patent: October 6, 1992
    Assignees: Yeda Research and Development Co., Ltd., Sor-Van Radiation Ltd.
    Inventors: Ora Kedem, Jonathan Ben-Dror