Appeal No. 95-4089
Application 08/090,073
little damage to the grout between the tiles and with
reduced irritation to the skin of the user.
43. The Cook compositions are described as having a
pH of generally 2-4 (col. 3, lines 52-53).
11 12
44. Cook provides examples with and without
cationic and/or anionic surfactants.
45. Cook differs from the subject matter of claim 1
in that Cook does not describe the use of maleic acid as one
of the acids which can be used as the "lower aliphatic ***
dicarboxylic acids" (col. 6, lines 31-32).
46. Cook further differs from the subject matter of
claims 9 and 10 in that Cook does not describe a composition
having a pH of 1.2.
Level of ordinary skill in the art
47. A person having ordinary skill in the art would
have appreciated the concern explicitly addressed by Cook that
the acid component should be readily soluble in water given
See, e.g., Example 2, Formula B containing MDAEM.11
See,, e.g., Example 1 and Example 2, Formula A, which do not have either an12
anionic or cationic surfactant.
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