US PATENT SUBCLASS 277 / 480
.~.~.~.~.~ Circular band having axially displaced undulations

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}
480.~.~.~.~.~ Circular band having axially displaced undulations

DEFINITION

Classification: 277/480

Circular band having axially displaced undulations:

(under subclass 478) Axially spaced, axially facing seats wherein the annular band has a wavy or sinuous structure radially perpendicular to the piston's reciprocating axis.