Appeal No. 1999-0404 Page 7
Application No. 08/580,256
Claim 1 reads as follows:
A heat transfer pipe used for a condenser and an
evaporator in a refrigerating cycle using a refrigerant
mixture, comprising main grooves and auxiliary grooves
each formed on the inner surface of said heat transfer
pipe with said main grooves intersecting said auxiliary
grooves, wherein said main grooves are separated by
ridges, and said ridges are divided into ribs by said
auxiliary grooves, and wherein a length of said ribs
formed along the direction of said main grooves is made
longer than a width of said ridges, a width of said
auxiliary grooves is made smaller than the length of said
ribs and further said auxiliary grooves are formed in a
direction where a pressure gradient in said heat transfer
pipe is reduced.
Chiang's invention relates generally to tubes used in
heat exchangers for transferring heat between a fluid inside
the tube and a fluid outside the tube. More particularly, his
invention relates to a heat transfer tube having an internal
surface that is capable of enhancing the heat transfer
performance of the
tube. Heat exchangers of air conditioning and refrigeration
(AC&R) or similar systems contain such tubes. Chiang teaches
(column 1, lines 51-65) that
[i]n order to simplify acquisition and stocking as well
as to reduce costs of manufacturing, it is desirable that
the same type of tubing be used to in all the heat
exchangers of a system. But heat transfer tubing that is
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