US PATENT SUBCLASS 277 / 460
.~.~.~ Circumferential groove, channel, recess, or bevel

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}
459  DF  .~.~ Piston ring including exposed port, slot, pocket, groove, channel, recess, or bevel {3}
460.~.~.~ Circumferential groove, channel, recess, or bevel {2}
461  DF  .~.~.~.~> Axially spaced {1}
463  DF  .~.~.~.~> Ports

DEFINITION

Classification: 277/460

Circumferential groove, channel, recess, or bevel:

(under subclass 459) Piston ring wherein the groove, channel,

recess, or bevel extends substantially annularly about the outer peripheral surface of the piston ring.