(under subclass 327) Apparatus in which the bit or any portion thereof is composed of either (1) two different materials, (2) a single material which has been treated to provide portions of the bit with specific properties which are different from the properties of another portion or (3) a particular material to which significance is attributed.
(1) Note. Under part (3), the mere recitation of iron or steel, per se, is excluded. However, specifying both iron and steel would be included under part (1).
(2) Note. Under part (3), a specific material need not be named as such but may be identified by its properties (e.g., ductile, malleable, hardened).
(3) Note. A bit provided with a welded brazed or soldered joint is considered to be formed of diverse materials.
SEE OR SEARCH THIS CLASS, SUBCLASS:
332+, for a core forming roller type bit.
339+, and 393, for a bit having a nozzle or slush tube which may be made of a specific material or a material different from the bit. 374+, for a rolling cutter bit made of a specific material.
403+, for a core forming type bit.
428+, for a compact.
420.2, for an impact type bit including diamonds.
434, for a bit including a diamond.
SEE OR SEARCH CLASS
51, Abrasive Tool Making Process, Material, or Composition, for an abrasive tool making process, material, or composition of general utility.
76, Metal Tools and Implements, Making,
102, and 108.1 for processes of making augers and drills usually of specific materials.
125, Stone Working, appropriate subclasses for stone working tools including diamond material, and particularly
30.01, for precious stone working and subclass 39 for diamond, surface traversing tools.
428, Stock Material or Miscellaneous Articles, 544+, for stock material or intermediate articles which are all metal or have adjacent metal components, including specific materials used in drill bits, where no specific drill-bit structure is claimed.
