US PATENT SUBCLASS 277 / 528
.~.~.~ Helically coiled packing

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}
510  DF  .~.~ Contained or compressed by gland member in packing box {10}
528.~.~.~ Helically coiled packing

DEFINITION

Classification: 277/528

Helically coiled packing:

Seal for the gland and packing box under subclass 510 wherein the seal has a spirally wound structure between the parts along their axis of relative motion.