Appeal No. 1999-0608 Page 13
Application No. 08/571,471
supporting a shaft (4) on which a dental cutting tool (3) is
detachably mounted. This admitted prior art does not specify
the material of the retainer (1).
Manwiller discloses sintered polyimide resin articles
(column 8, lines 60-68) which have desirable electrical,
physical and chemical characteristics, such as corrosion
resistance and resistance to melting upon exposure to high
temperatures for extended periods of time, such that they
retain their strength and exhibit excellent response to work-
loading at elevated temperatures for prolonged periods of time
(column 7, line 65, to column 8, line 13). Manwiller further
teaches that such articles are useful "as high temperature
mechanical and electrical parts, such as bearings and seals,
particularly those requiring low thermal expansion" (column
13, lines 52-55).
The selection of a known material based upon its
suitability for the intended use is a design consideration
within the skill of the art. In re Leshin, 277 F.2d 197, 199,
125 USPQ 416, 418 (CCPA 1960).
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