Patents Examined by O. R. Vertz
  • Process of stabilization of anhydrous dibasic calcium phosphate against fluorine ions with cyclic aminophosphonic acids
    Patent number: 4130630
    Abstract: A process for stabilizing anhydrous dibasic calcium phosphate against reaction with fluorine ions comprising treating an aqueous suspension of anhydrous dibasic calcium phosphate at a pH of from 5 to 10 with a cyclic aminophosphonic acid of the formula ##STR1## WHEREIN N IS AN INTEGER FROM 1 TO 3, OR A WATER-SOLUBLE SALT THEREOF, IN AN AMOUNT OF FROM 0.01% TO 5% BY WEIGHT WITH REFERENCE TO THE ANHYDROUS DIBASIC CALCIUM PHOSPHATE; AS WELL AS TOOTH CLEANING PREPARATIONS CONTAINING THE STABILIZED ANHYDROUS DIBASIC CALCIUM PHOSPHATE.
    Type: Grant
    Filed: December 1, 1975
    Date of Patent: December 19, 1978
    Assignee: Henkel Kommanditgesellschaft auf Aktien (Henkel KGaA)
    Inventors: Walter Ploger, Claus Gutzschebauch