Patents Examined by Hoa Vance
  • Chelation
    Patent number: 4579720
    Abstract: Hydroxymethane diphosphonic acid and alkali metal or ammonium salt of such acid are prepared. They are useful in detergent compositions and in sequestering and chelating polyvalent metals.
    Type: Grant
    Filed: October 6, 1983
    Date of Patent: April 1, 1986
    Assignee: Plains Chemical Development Co.
    Inventor: Edward G. Budnick