US PATENT SUBCLASS 277 / 444
.~.~.~.~ Chromium

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}
444.~.~.~.~ Chromium

DEFINITION

Classification: 277/444

Chromium:

(under subclass 442) Piston ring wherein the surface has chrome provided as a layer on the surface or chemically infused near the surface.

SEE OR SEARCH CLASS

205, Electrolysis: Processes, Compositions Used Therein, and Methods of Preparing the Compositions; for a process of making an electrolytic coating not provided for elsewhere,

178+, for multiple superposed coatings having at least one chromium-containing coating, or subclasses 283+ for a predominately chromium coating.