Appeal No. 1998-1146 Page 2
Application No. 08/410,177
BACKGROUND
Appellants' invention in its broadest form relates to a
composition consisting essentially of 1,3-dioxolane and one of
cyclopentane, 2-methyl pentane, 3-methyl pentane or n-hexane
in specified amounts. The composition is described as
possessing azeotropic attributes by appellants. The
composition is disclosed as being useful as a blowing agent in
the production of foams and for solvent cleaning applications
(specification, pages 4 and 5). An understanding of the
invention can be derived from a reading of exemplary claim 1,
which is reproduced below.
1. An azeotropic composition consisting
essentially of
a) from about 4 to about 50% by weight 1,3-
dioxolane and
b) one compound selected from the group
consisting of
1) from about 75 to about 96% by weight
cyclopentane or
2) from about 60 to about 79% by weight 2-
methyl pentane or
3) from about 59 to about 77% by weight 3-
methyl pentane or
4) from about 50 to about 69% by weight n-
hexane in which the sum of the weight percent of
a) plus weight percent b) is approximately 100
percent.
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