US PATENT SUBCLASS 277 / 488
.~.~.~ For axially adjacent piston rings

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}
467  DF  .~.~ Particular piston ring expander {12}
488.~.~.~ For axially adjacent piston rings

DEFINITION

Classification: 277/488

For axially adjacent piston rings:

(under subclass 467) Particular piston ring expander wherein the piston ring expander engages piston rings that adjoin each other along their radially extending circumferences.

(1) Note. The ring may be separate or may be part of a unitary, overlapping structure forming a helix.

SEE OR SEARCH THIS CLASS, SUBCLASS:

489+, for a piston ring having sectional structure.