US PATENT SUBCLASS 295 / 30
.~ Composition
Current as of: June, 1999
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DEFINITION
Classification: 295/30
(under subclass 1) Railway-car wheels claimed significantly as to wheel structure and formed from a composition metal or entirely from a single metal, but treated so as to have different physical properties in the different parts of the wheels, such as chill-hardened rims or hubs.
(1) Note. Where the wheel is claimed with no significant wheel structure but merely in terms of the composition or material of which it is composed, it will be classified in the appropriate composition or material class even though there is no claim to the composition or material, per se. In this connection the classes under the Search Class notes below should be considered
SEE OR SEARCH CLASS
148, Metal Treatment, particularly
569, and 581+ for processes of metal casting, fusion bonding, machining, or working combined with significant heat treatment of railway wheels and axles to modify or maintain the internal physical structure (i.e., microstructure) or chemical property of metal. See the Class 148 definition to determine what constitutes significant heat treatment. Without metal casting, fusion bonding, ma-chining, or working, Class 148 will take any heat treatment to modify or maintain the internal physical structure (i.e., microstructure) or chemical property of metal.
420, Alloys or Metallic Compositions, for articles defined solely by their metal or alloy composition.
428, Stock Material or Miscellaneous Articles, 544+, for wheels made of metal which are so broadly claimed as to be merely stock material, especially subclasses 615+ for plural-layered metallic stock defined in terms of the composition of its components.
