US PATENT SUBCLASS 277 / 478
.~.~.~.~ Axially spaced axially facing seats

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.~.~.~.~ Axially spaced axially facing seats {3}
479  DF  .~.~.~.~.~> Circular band having radially displaced undulations
480  DF  .~.~.~.~.~> Circular band having axially displaced undulations
481  DF  .~.~.~.~.~> U-shaped circular band radially directed either inwardly or outwardly throughout its circumference

DEFINITION

Classification: 277/478

Axially spaced axially facing seats:

(under subclass 477) Particular piston ring expander wherein the piston ring expander has more than one radially extending surface intended to space, position, retain, or bias separate and distinct piston rings along the piston's reciprocating axis.