US PATENT SUBCLASS 277 / 450
.~.~.~ Helical form

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}
450.~.~.~ Helical form

DEFINITION

Classification: 277/450

Helical form:

(under subclass 449) Particular piston seat wherein the groove is a helix or spiral along the cylindrical face of the piston and accommodates a similarly shaped piston ring or piston ring expander.

SEE OR SEARCH THIS CLASS, SUBCLASS:

458, for a piston ring having a single piece noncircular or multi-turn (e.g., helical, spiral, oblong, elliptical, polygonal, etc.) shape.