Appeal No. 2000-1638
Application No. 08/829,699
examiner. For the reasons which follow, we cannot sustain the
examiner's rejections.
Yamamoto discloses an inner-worked heat transfer pipe
adapted for use in both evaporation and condensation
applications, such as heat-pump applications. Yamamoto
discusses some of the shortcomings of prior art heat transfer
pipes in achieving acceptable performance in both evaporative
and condensation applications (translation, page 4). The
objective of Yamamoto's invention is to offer an inner-worked
heat transfer pipe that has better evaporation performance
than inner-grooved heat transfer pipes in the prior art and
has better condensation performance than the types of prior
art heat transfer pipes discussed on page 4 of the
translation.
Yamamoto's heat transfer pipe 1 comprises, on its inner
surface, a series of parallel grooves 11 separated by fins 12
that have an 18 lead angle to the pipe axis and projectionso
13, which are 3/5 or less, preferably 1/5 to 1/2, the height
of the fins 12, on the floor of the grooves 11. These
projections increase surface tension inside grooves 11 and
prevent coolant inside grooves 11 from escaping from the inner
4
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