US PATENT SUBCLASS 277 / 457
.~.~.~ Having passageway for fluid return, pressure relief, or venting

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}
457.~.~.~ Having passageway for fluid return, pressure relief, or venting

DEFINITION

Classification: 277/457

Having passageway for fluid return, pressure relief or venting:

(under subclass 449) Particular piston seat wherein the groove has an opening for return of fluid or for releasing or relieving fluid pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

928, for a seal having a pressure relief or venting feature for other than a piston ring seat including a passageway for fluid return, pressure relief, or venting.