Appeal No. 96-4084
Application 08/178,508
contrast, Cressey discloses that the method and tool therein are
for producing threading on or in “tapered pins or recesses”
(emphasis added), particularly those adapted for use in the
threading of tapered pins and socket members of well drilling,
and pumping equipment, such as drills, underreamers, and casing
and tubing couplings. The examiner has dismissed the limitations
of the preamble of claim 18 as being of negligible weight and
also concluded that the forming tool of Cressey is “capable of
being employed in such a manner” (answer, page 7). We do not
share the examiner’s view that the tool of Cressey is capable of
forming “dual synchronized threads on internal and external
cylindrical surfaces of an object,” as set forth in appellants’
claim 18. In our opinion, the taper of the teeth (3) on the
cutter (2) of Cressey (e.g., as seen in Figures 1, 4 and 7) is
such as to preclude the use of this tool in forming “dual
synchronized threads” on internal and external cylindrical sur-
faces of an object. Moreover, we agree with appellants (brief,
page 9) that the tool of Cressey does not meet the requirement of
claim 18 that the thread forming surfaces (e.g., the cutting edge
tips 16 and 18 seen in appellants’ Figure 1) be located “in a
plane coincident with the mounting base longitudinal axis.” As
clearly seen in Figures 2, 3, 5 and 6 of Cressey, the thread
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