Appeal No. 96-0011 Page 6
Application No. 07/993,896
lubricating grease containing a synthetic oil and appellant’s
polyurea. The subject matter of claim 3 requires the presence
of a polyurea which is the reaction product of a mono or di
aromatic isocyanate with an aliphatic primary amine having 8 to
22 carbon atom alkyl or alkenyl groups. Although Ehrlich’s
polyurea requires the presence of a diamine in addition to the
claimed reactants, said component is not excluded from the
claimed polyurea. See Ehrlich, column 1, lines 45 - 51. While
the claimed polyurea is the reaction product of two components,
our construction of the claimed subject matter provides that
the reaction may have any number of additional components
present, provided only that the required reactants of the
claimed subject matter are present. Based upon the above
interpretation, the polyurea of Ehrlich reads on the polyurea
of claim 3.
Furthermore, Ehrlich discloses that the polyurea
thickening agent may be present in proportions of 2 to about
20% by weight, overlapping the range required by the claimed
subject matter. See column 2, line 23 - 24.
The other component required by the claimed subject
matter is a base oil consisting of an ester of an aromatic di,
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