Appeal No. 95-0448
Application 07/825,632
used to produce xanthan gum prior to the effective filing date
of this application. Xanthan gum is water-soluble and has a
high
viscosity. Thus it is useful as a thickener in various food
and cosmetic products. The claimed fermentation method is
characterized by appellants as providing a higher yield of
xanthan gum than had been known in the art prior to this
invention. The method comprises culturing a strain of
Xanthomonas campestris, wherein the strain has been altered
via the addition of a specific exogenous DNA fragment. Prior
to being altered by an added exogenous DNA fragment, the
unmodified starting strain of the claims is a mutant incapable
of xanthan production, referred to as an Xgs mutant. The-
source of the added DNA is a genome of Xanthomonas campestris.
The claim identifies the added DNA by genomic restriction map
segments which are carried on plasmids. Each of the
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