US PATENT SUBCLASS 277 / 451
.~.~.~ Stepped walls

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}
449  DF  .~.~ Particular piston seat {6}
451.~.~.~ Stepped walls

DEFINITION

Classification: 277/451

Stepped walls:

(under subclass 449) Particular piston seat wherein the groove has a nonuniform axial width and walls that are at a right angle to each other.

SEE OR SEARCH THIS CLASS, SUBCLASS:

586, for a dynamic, circumferential contact seal for other than a piston seated in a groove having stepped walls.