US PATENT SUBCLASS 277 / 462
.~.~.~.~.~ Ports

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  DF  .~.~.~ Circumferential groove, channel, recess, or bevel {2}
461  DF  .~.~.~.~ Axially spaced {1}
462.~.~.~.~.~ Ports

DEFINITION

Classification: 277/462

Ports:

(under subclass 461) Axially spaced wherein the piston ring has through holes.

(1) Note. A "port" or "through hole" is a passageway extending through the ring and totally enclosed by the material of the ring.

SEE OR SEARCH THIS CLASS, SUBCLASS:

463, for a piston ring having an exposed circumferential groove, channel, recess, or bevel, and ports.

464, for a piston ring having an exposed port, slot, pocket, groove, channel, recess, or bevel and circumferentially spaced ports.