Interference 103,482
production of polymers classically defined as having
syndiotactic and isotactic sequences, Ewen states (Ewen, U.S.
4,794,096, col. 1, l. 18-43; emphasis added):
The present invention provides a hafnium
metallocene catalyst useful in the polymerization
of olefins, particularly propylene and higher alpha-
olefins, and in the copolymerization of olefins,
especially ethylene and propylene.
. . . . .
The use of metallocenes as catalysts in the
copolymerization of ethylene and other alpha-olefins
is also known in the art. U.S. Pat. No. 4,542,199 to
Kaminsky, et al. discloses a process for the
polymerization
of olefins and particularly for the preparation of
polyethylene and copolymers of polyethylene and other
alpha-olefins.
As in Ewen’s earlier patent disclosures, the
specification of Dolle Application 08/147,006 defines the
claimed processes
of preparing polyolefins in classical terms of the resultant
syndiotactic and isotactic sequences of the polymer produced
and the ethylene and propylene monomers polymerized to form
the product. Persons skilled in the art reasonably would have
interpreted the scope of the subject matter covered by Dolle’s
claims in light of Dolle’s disclosure and conventional wisdom
in the art. Convention wisdom in the art instructs that
ethylene may only be copolymerized to produce polymers having
100
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