US PATENT SUBCLASS 277 / 459
.~.~ Piston ring including exposed port, slot, pocket, 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.~.~ Piston ring including exposed port, slot, pocket, groove, channel, recess, or bevel {3}
460  DF  .~.~.~> Circumferential groove, channel, recess, or bevel {2}
464  DF  .~.~.~> Circumferentially spaced ports
465  DF  .~.~.~> Circumferentially spaced slots, pockets, grooves, channels, recesses, or bevels

DEFINITION

Classification: 277/459

Piston ring including exposed port, slot, pocket, groove, channel, recess, or bevel:

(under subclass 434) Piston ring including an uncovered opening, incline, removed, or indented portion on an outer peripheral surface of the piston ring.

(1) Note. The enclosing wall or piston can cover the exposed or passageway, slot, pocket, groove, channel, recess, or bevel but not another ring or expander.

(2) Note. An expander or spacer for spacing one or more separate piston rings is not a piston ring even if it directly engages the enclosing wall.

SEE OR SEARCH THIS CLASS, SUBCLASS:

477+, for a particular piston ring expander having a slotted or undulating circular band having an inclined or axially facing seat for the piston ring.

484, for a piston ring expander having a radially extending tongue formed from it.