Appeal No. 95-4089
Application 08/090,073
a. a surfactant inter alia selected from the
group consisting of anionic, nonionic or cationic surfactants
or mixtures thereof (col 2, lines 34-38);
b. phosphoric acid (col. 4, lines 9-11); and
c. a carboxylic acid (col. 3, line 52 through
col. 4, line 8).
13. With respect to the carboxylic acid, Thomas says
the following (col. 3, line 54 through col. 4, line 4)
(discussion with respect to the number of carbon atoms and
emphasis added):
Various *** carboxylic acids can perform *** [the]
function [of lowering the pH to 1 to 4] but those which
have been found *** [effective] to remove soap scum and
lime scale from bathroom surfaces best, while still not
destabilizing the emulsion, are polycarboxylic acids, and
of these the dicarboxylic acids are preferred. Of the
dicarboxylic acids group, which includes those of 2 to 10
carbon atoms, from oxalic acid [2 carbon atoms] through
sebacic acid [10 carbon atoms], [each of] suberic [8
carbon atoms], azelaic [9 carbon atoms] and sebacic acids
[10 carbon atoms] are of lower solubilities and therefore
are not as useful in the present emulsions as other
dibasic [i.e., dicarboxylic] aliphatic fatty acids, all
of which are preferably saturated and straight chained.
Oxalic [2 carbon atoms] and malonic acids [3 carbon
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