US PATENT SUBCLASS 277 / 458
.~.~ Piston ring having single piece noncircular or multiturn (e.g., helical, spiral, oblong, elliptical, polygonal, etc.) shape

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}
458.~.~ Piston ring having single piece noncircular or multiturn (e.g., helical, spiral, oblong, elliptical, polygonal, etc.) shape

DEFINITION

Classification: 277/458

Piston ring having single piece noncircular or multiturn (e.g., helical, spiral, oblong, elliptical, polygonal, etc.) shape:

(under subclass 434) Piston ring wherein the piston ring has a helical or spiral form or shape other than circular in either a relaxed or stressed state.

SEE OR SEARCH THIS CLASS, SUBCLASS:

450, for a piston groove having a helical form intended to accommodate a similarly shaped piston ring or piston ring expander.