US PATENT SUBCLASS 123 / 90.51
.~.~ Composition, surface treatment manufacture

Current as of: June, 1999
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123 /   HD   INTERNAL-COMBUSTION ENGINES

90.1  DF  POPPET VALVE OPERATING MECHANISM {19}
90.48  DF  .~ Tappet {4}
90.51.~.~ Composition, surface treatment manufacture

DEFINITION

Classification: 123/90.51

(under subclass 90.48) Device wherein the composition of material or the surface treatment or the process of manufacture, or more than one of them, of a tappet element is of primary concern.

SEE OR SEARCH CLASS

29, Metal Working,

888.43, for a process of making a tappet.

428, Stock Material or Miscellaneous Articles,

544+, for stock materials, e.g., of indefinite length, which are all metal or have adjacent metal components.