Appeal No. 2003-0816
Application No. 09/693,254
Rather than reiterate the conflicting viewpoints advanced by the Examiner
and Appellant concerning the above-noted rejection, we refer to the Answer and the
Brief and Reply Brief.
Appellant’s invention is directed to a composition for controlled delivery of
an active substance in to aqueous medium by erosion, at a preprogramed rate, of the
composition. (Brief, p. 2). Claim 1, which is representative of the claimed
invention, appears below:
1. A composition for controlled delivery of at least one active
substance into an aqueous medium by erosion of at least one surface
of the composition, wherein said erosion occurs at a preprogrammed
rate, comprising
i) a matrix comprising the active substance, wherein the matrix is
erodible in the aqueous medium in which the composition is used and
wherein the matrix allows substantially no diffusion of water into the
composition beyond any exposed surface layers of the matrix, and
ii) a coating having at least one opening exposing at least one surface
of said matrix, the coating comprising
a) a first cellulose derivative which has thermoplastic properties and
which is substantially insoluble in the aqueous medium in which the
composition is used,
and at least one of
b) a second cellulose derivative which is soluble or dispersible in
water,
3
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