US PATENT SUBCLASS 277 / 443
.~.~.~.~ Nitrided

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  DF  .~.~.~ Surface coating, plating, or impregnation {2}
443.~.~.~.~ Nitrided

DEFINITION

Classification: 277/443

Nitrided:

(under subclass 442) Piston ring wherein the chemical infusion of nitrogen increases the nitrogen content of the surface.

SEE OR SEARCH CLASS

148, Metal Treatment,

238, for a process of nitriding using an externally supplied nitrogen source or subclasses 317+ for a stock product of the nitriding process.