US PATENT SUBCLASS 277 / 464
.~.~.~ Circumferentially spaced ports

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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}
464.~.~.~ Circumferentially spaced ports

DEFINITION

Classification: 277/464

Circumferentially spaced ports:

(under subclass 459) Piston ring wherein the piston ring has annularly spaced 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:

462, for a piston ring having exposed axially spaced circumferential grooves, channels, recesses or bevels and ports.

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