Appeal No. 1998-2836
Application No. 08/453,211
fields. See p. 1, ll. 1-3. The composition comprises a sol
(a colloidal solution) of acidic aqueous chitosan,
hydroxyapatite (hereinafter referred to as “HAp”) and zinc 3
oxide and/or magnesium oxide in powder form. See p. 2, ll.
14-19 and claim 1.
Oonishi discloses a hardening material useful as a root
canal sealer, cement and a filling agent for dental use, or as
a bone cement or filling agent. See col. 37, ll. 60-63. The
hardening material disclosed by the reference comprises, inter
alia, calcium phosphate and a setting liquid, with at least
part or the whole of the calcium phosphate powder being either
one or both of "-tricalcium phosphate (hereinafter referred to
as ""-TCP”) and tetracalcium phosphate (hereinafter referred
to as "4CP”). A residual part of the calcium phosphate powder
is taken by HAp, apatite carbonate, $-tricalcium phosphate
(hereinafter referred to as "$-TCP"), and calcium hydrogen
phosphate dihydrate etc. See col. 3, ll. 39-46. Oonishi also
teaches that
3 The American Heritage Dictionary of the English
Language, Third Edition, (1992), defines “hydroxyapatite” as
"[t]he principal bone salt, Ca (PO ) OH, which provides the
5 4 3
compressional strength of vertebrate bone."
8
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