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Class Information
Number:
29/890.147
Name:
Metal working
>
Method of mechanical manufacture
>
Gas and water specific plumbing component making
> Return connector device making
Description:
Process wherein the manufactured article forms at least part of an enclosed passageway or channel for conveying gas or water back to its starting point or previous location.
Patents under this class:
Patent Number
Title Of Patent
Date Issued
6687996
Method of making an exhaust gas collector
Feb. 10, 2004
6643930
Method and apparatus for producing end flange member for cylindrical duct
Nov. 11, 2003
6594900
Method for manufacturing a pipe connector of a gas isolated switchgear
Jul. 22, 2003
5051076
Two-cylinder-type rotary compressor system having improved suction pipe coupling structure
Sep. 24, 1991
4077559
Oval bell concept
Mar. 7, 1978
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