US PATENT SUBCLASS 277 / 442
.~.~.~ Surface coating, plating, or impregnation

Current as of: June, 1999
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277 /   HD   SEAL FOR A JOINT OR JUNCTURE

345  DF  SEAL BETWEEN RELATIVELY MOVABLE PARTS (I.E., DYNAMIC SEAL) {10}
434  DF  .~ Piston ring or piston ring expander or seat therefor {15}
440  DF  .~.~ Piston ring surface of dissimilar material or hardness {2}
442.~.~.~ Surface coating, plating, or impregnation {2}
443  DF  .~.~.~.~> Nitrided
444  DF  .~.~.~.~> Chromium

DEFINITION

Classification: 277/442

Surface coating, plating or impregnation:

(under subclass 440) Piston ring wherein the use of chemical infusion (e.g., nitriding, etc.) provides a different material, hardness, or density as a layer on the surface or near the surface.