US PATENT SUBCLASS 277 / 490
.~.~.~ Eccentric or variable thickness component ring

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}
489  DF  .~.~ Sectional piston ring structure {2}
490.~.~.~ Eccentric or variable thickness component ring

DEFINITION

Classification: 277/490

Eccentric or variable thickness component ring:

(under subclass 489) Sectional piston ring wherein the component has a radial periphery of changing radius or an axial periphery of changing thickness.

(1) Note. The shape of the sectional piston ring formed by the component rings can be eccentric or concentric or of uniform or variable thickness.

SEE OR SEARCH THIS CLASS, SUBCLASS:

458, for a piston ring having a single piece, noncircular, or multiturn (e.g., helical, spiral, oblong, elliptical, polygonal, etc.) shape.