US PATENT SUBCLASS 277 / 559
.~.~.~ Hydrodynamic sealing feature

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}
500  DF  .~ Circumferential contact seal for other than piston {13}
549  DF  .~.~ Peripheral radially sealing flexible projection (e.g., lip seal, etc.) {12}
559.~.~.~ Hydrodynamic sealing feature

DEFINITION

Classification: 277/559

Hydrodynamic sealing feature:

(under subclass 549) Peripheral, radially sealing, flexible projection including means to create a turbulence at the point of relatively movable contact between the flexible projection and the relatively movable part.

(1) Note. For this subclass, dust or dirt in a vacuum, liquid, or gas is considered a fluid.