Appeal No. 1998-2297
Application 08/353,622
on the surface by hand application, preferably with a sponge
or cloth, and is removed by a combination of rinsing and
wiping, preferably with a sponge, after which it may be left
to dry to a shine, or may be dried with a cloth” (col. 10,
lines 21-30). Thomas also discloses: “In use, the
microemulsion is sprayed onto ‘bathtub ring’ on a bathtub,
which also includes lime scale, in addition to soap scum and
greasy soil. The rate of application is about 5 ml. per 5
meters of ring (which is about 3 cm. wide). After application
and a wait of about two minutes the ring is wiped off with a
sponge and is sponged off with water. It is found that the
greasy soil, soap scum, and even the lime scale, have been
removed effectively. In those cases where the lime scale is
particularly thick or adherent a second application may be
desirable, but that is not considered to be the norm” (col.
11, lines 19-29). The examiner has not explained, and it is
not apparent, why these disclosures of use of little wiping
with a paper towel or sponge would have indicated to one of
ordinary skill in the art that optimum results would be
obtained by rubbing the surface using a high speed rotary
power tool.
-8-8
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