US PATENT SUBCLASS 277 / 481
.~.~.~.~.~ U-shaped circular band radially directed either inwardly or outwardly throughout its circumference

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  DF  .~.~.~ Slotted or undulating circular band including inclined or axially facing seat for the piston ring {1}
478  DF  .~.~.~.~ Axially spaced axially facing seats {3}
481.~.~.~.~.~ U-shaped circular band radially directed either inwardly or outwardly throughout its circumference

DEFINITION

Classification: 277/481

U-shaped circular band radially directed either inwardly or outwardly through out its circumference:

(under subclass 478) Axially spaced, axially facing seats wherein the annular band has a channel-shaped cross-section oriented radially in either an inward or outward facing direction throughout its perimeter.

(1) Note. The U- or channel-shaped structure does not have to be continuous or unbroken throughout its circumference.