US PATENT SUBCLASS 277 / 466
.~.~ Piston ring displays twisting or torsion

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}
466.~.~ Piston ring displays twisting or torsion

DEFINITION

Classification: 277/466

Piston ring displays twisting or torsion:

(under subclass 434) Piston ring wherein the piston ring's configuration exhibits a rotating or cocking movement during the reciprocating operation of the piston.