US PATENT SUBCLASS 277 / 477
.~.~.~ Slotted or undulating circular band including inclined or axially facing seat for the piston 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}
467  DF  .~.~ Particular piston ring expander {12}
477.~.~.~ Slotted or undulating circular band including inclined or axially facing seat for the piston ring {1}
478  DF  .~.~.~.~> Axially spaced axially facing seats {3}

DEFINITION

Classification: 277/477

Slotted or undulating circular band including inclined or axially facing seat for the piston ring:

(under subclass 467) Particular piston ring expander wherein the piston ring expander is a resilient annular band having openings therein or having a wavy or corrugated contour, and a radially extending surface intended to space, position, retain, or bias a separate and distinct piston ring.

SEE OR SEARCH THIS CLASS, SUBCLASS:

459+, for a piston ring having an exposed port, slot, pocket, groove, channel, recess, or bevel

485, for a piston ring expander having an undulating structure providing an axially extending face against the inner periphery of the piston ring.