US PATENT SUBCLASS 277 / 491
.~.~.~ C, L, T, U, V, or Z cross-sectional profile

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}
489  DF  .~.~ Sectional piston ring structure {2}
491.~.~.~ C, L, T, U, V, or Z cross-sectional profile {1}
492  DF  .~.~.~.~> Three or more sections

DEFINITION

Classification: 277/491

C, L, T, U, V, or Z cross-sectional profile:

(under subclass 489) Sectional piston ring wherein the component has a C-, L-, T-, U-, V-, or Z-shape in a view of a vertical plane cutting across the component ring at right angles to one of its principal horizontal dimensions.

SEE OR SEARCH THIS CLASS, SUBCLASS:

530, for a dynamic, circumferential, contact seal for other than a piston intended to be contained or compressed by a gland member in a packing box having a C, M, U, V, X, or Z cross-sectional seal shape.