US PATENT SUBCLASS 277 / 438
.~.~.~ Having C, U, or V 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}
436  DF  .~.~ Piston ring having peripheral radially sealing flexible projection (e.g., piston cup, etc.) {2}
438.~.~.~ Having C, U, or V cross-sectional profile {1}
439  DF  .~.~.~.~> Axially facing cup

DEFINITION

Classification: 277/438

Having C, U, or V cross-sectional profile:

(under subclass 436) Peripherally radially sealing flexible projection wherein the piston ring has a C-, U-, or V-shape in a view of a vertical plane cutting across the piston ring at right angles to one of its principle horizontal dimensions.