US PATENT SUBCLASS 277 / 454
.~.~.~.~.~ Having parallel 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}
452  DF  .~.~.~ Oblique wall {1}
453  DF  .~.~.~.~ More than one oblique wall {1}
454.~.~.~.~.~ Having parallel walls

DEFINITION

Classification: 277/454

Having parallel walls:

(under subclass 453) More than one oblique wall wherein the groove has any tapered or inclined walls that are parallel to each other.