Appeal No. 1998-2523
Application No. 08/778,644
Ishikawa teaches bleaching solution that comprise as a bleaching agent a ferric
complex salt of ethylenediaminetetraacetic acid and a ferric 1,3
diaminopropanetetaacetate complex salt. (Col. 3, ll. 10 to 20.) Ishikawa discloses
the bleaching solution has a minimal reduction in bleaching power and prevents
bleaching fog. (Col. 3, ll. 44 to 48.) In addition to the bleaching agent, the bleaching
solution can contain a bleaching accelerator, rehalogenating agents such as,
ammonium bromide and further additives to adjust the pH including organic or
inorganic acids. Ishikawa also discloses bleaching solutions comprising the
combination of a tank solution and a replenisher composition. The bleaching solution
contains ferric ammonium ethylenediaminetetraacetic (dihydrate) and
ammonium bromide. (Col. 73, ll. 1 to 19.) The running bleaching solutions, process
numbers 1 and 4, are described as having a pH of 5.5. (Cols., 73 to 74, Table 2.)
Okauchi describes a bleaching composition that comprises 150.0g/l of
ferric-ethylenediaminetetraacetic acid ammonium and 80g/l of ammonium bromide.
The pH of the composition was adjusted to 5.6. (Col. 15, l. 65 to col. 16, l. 4.) In a
different embodiment, Okauchi describes a bleaching composition that comprises
110.0g/l of ferric-ethylenediaminetetraacetic acid ammonium, 80g/l of potasium
-6-
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 Next
Last modified: November 3, 2007