US PATENT SUBCLASS 285 / 179.2
.~.~ Sheet-metal
Current as of:
June, 1999
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285 /
HD
PIPE JOINTS OR COUPLINGS
179
DF
ELBOW
{5}
179.1
DF
.~ With access opening {1}
179.2
.~.~ Sheet-metal
DEFINITION
Classification: 285/179.2
Sheet-metal:
(under subclass 179.1) Subject matter wherein the conduit comprises very thin-walled material (e.g., heating duct, etc.).