US PATENT SUBCLASS 72 / 370.26
.~.~.~ Polygon cross section (e.g., rectangular)
Current as of:
June, 1999
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72 /
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METAL DEFORMING
362
DF
PROCESS
{8}
367.1
DF
.~ Tube making or reshaping {11}
370.23
DF
.~.~ Change in cross section {2}
370.26
.~.~.~ Polygon cross section (e.g., rectangular)
DEFINITION
Classification: 72/370.26
Polygon cross section (e.g., rectangular):
(under subclass 370.23) Process in which the tube* is deformed to produce a profile having three or more straight conjoining sides.