Patents Examined by Thon Chea
  • Bleaching bath concentrate
    Patent number: 4923785
    Abstract: The one-part aqueous bleaching bath concentrate containing an ammonium iron (III) complex salt concentration of at least 0.4 mol per liter, an ammonium bromide concentration of from 1.5 to 3 mol per liter, an ammonium nitrate concentration of from 0.25 to 1 mol per liter and a pH below 3 is stable in storage.
    Type: Grant
    Filed: July 5, 1988
    Date of Patent: May 8, 1990
    Assignee: AGFA Gevaert AG
    Inventor: Karl Frank