Appeal No. 1999-0608 Page 9
Application No. 08/571,471
containing polyimide resin and, for the reasons set forth
below, conclude that the combined teachings of appellant's
APA, Matsumoto and Dan'hata are sufficient to have suggested
to one of ordinary skill in the art at the time of appellant's
invention the subject matter of the appealed claims.
The APA discussed on page 2 of the appellant's
specification discloses a rolling bearing comprising a
retainer made of a polyamideimide resin and impregnated with a
completely fluorinated oil.
Dan'hata discloses a sliding material for use in a
bearing comprising a mixture of 40 to 70% of an ethylene
tetrafluoride resin (PTFE), 20 to 40% polyimide resin as a
heat-resistant resin and a solid lubricant resin (translation,
pages 3 and 4). The sliding material has a porosity of 10 to
20%. According to Dan'hata, the resulting material is a wear-
resistant material having outstanding frictional
characteristics and improved holding capacity for lubricating
oils, as compared with PTFE alone.
Matsumoto discloses molding and sintering of a mixture of
boron carbide and mesophase carbon spherocrystal (translation,
page 2).
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