.~ Workpiece with longitudinal passageway or stopweld material (e.g., for tubular stock, etc.)
DEFINITION
Classification: 428/586
(under subclass 544) Subject matter drawn to stock-material* which is to be worked upon in a metal-working or similar operation, which contains therein an empty longitudinal passageway insufficient to form a conduit or a material, usually nonmetal, which is resistant to bonding to the adjacent metal when subjected to heat and/or working.
SEE OR SEARCH THIS CLASS, SUBCLASS:
34.1+, and 188, for nonmetallic* stock-material* having a longitudinal or transverse tubular or cavity.
595, for stock-material* having a channel shape.
SEE OR SEARCH CLASS
72, Metal Deforming, 54+, for effecting mechanical treatment of metal work by the development of pressure within a granular or particulate or soft metal material which may be confined within said metal work, e.g., a hollow workpiece.
138, Pipes and Tubular Conduits, appropriate subclasses for tubular stock-material* and for tube and ring blanks which are themselves tubes which can conduct a fluid.
