Appeal No. 95-3834
Application No. 07/947,569
lubricant disclosed in McCready does not contain a granular
metal alloy material.
Cairns relates to bearing compositions and a method of
forming the compositions into bearing elements. The bearing
compositions comprise a major portion of a thermoplastic resin
other than polytetrafluoroethylene and a minor portion of a
filled polytetrafluoroethylene material. The filled
polytetrafluoroethylene material comprises a polytetra-
fluoroethylene polymer, a first filler material and a second
filler material. The first filler material includes titanium
oxide, and the second filler material includes copper alloy
(col. 1, line 65-col. 2, line 15). Preferably, the bearing
materials are initially in dry powder form (col. 5, lines 3-
5). However, the materials are subsequently mixed together
and formed into bearings using injection molding and hot
extrusion methods (col. 2, lines 15-17).
According to the examiner (Answer, p.4):
One would have been motivated to . . . [modify the
dry powder lubricant of McCready by additionally
adding a metal alloy] because of the statement in
Carins [sic] at column 3, line 52: “The lubricant
[ie. the PTFE] is more effective by virtue of its
having something to hang onto as contrasted to just
being in contact with a smooth steel surface.”
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