US PATENT SUBCLASS 277 / 492
.~.~.~.~ Three or more sections

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}
491  DF  .~.~.~ C, L, T, U, V, or Z cross-sectional profile {1}
492.~.~.~.~ Three or more sections

DEFINITION

Classification: 277/492

Three or more sections:

(under subclass 491) Sectional piston ring wherein the sectional piston ring has at least three component rings.