US PATENT SUBCLASS 277 / 430
.~.~.~ Helical groove or thread on axially extending surface

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}
409  DF  .~ Close proximity seal (e.g., contactless, fluent, etc.) {4}
423  DF  .~.~ Impeller (e.g., slinger, etc.) {5}
430.~.~.~ Helical groove or thread on axially extending surface

DEFINITION

Classification: 277/430

Helical groove or thread on axially extending surface:

(under subclass 423) Impeller seal wherein the impeller has an indent or projection winding twistlike about its axially extending surface to act upon the sealed or sealing fluid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

559, for a dynamic, circumferential contact seal for other than a piston having a peripheral, radially sealing, flexible projection having a hydrodynamic, sealing feature.