US PATENT SUBCLASS 277 / 499
.~.~.~ Arcuate or beveled mating surfaces

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}
498  DF  .~.~ Split single piece piston ring having other than opposed asymmetrical mirrored ends {1}
499.~.~.~ Arcuate or beveled mating surfaces

DEFINITION

Classification: 277/499

Arcuate or beveled mating surfaces:

(under subclass 498) Split single piece piston ring wherein the opposed ends have curved or angular engaging surfaces.