US PATENT SUBCLASS 277 / 473
.~.~.~.~ Between piston rings

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}
467  DF  .~.~ Particular piston ring expander {12}
472  DF  .~.~.~ Annular expander nested in annular groove of the piston ring {3}
473.~.~.~.~ Between piston rings

DEFINITION

Classification: 277/473

Between piston rings:

(under subclass 472) Particular annular piston ring expander wherein the piston ring expander nests in annular grooves formed between piston rings.