US PATENT SUBCLASS 277 / 489
.~.~ Sectional piston ring structure

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}
489.~.~ Sectional piston ring structure {2}
490  DF  .~.~.~> Eccentric or variable thickness component ring
491  DF  .~.~.~> C, L, T, U, V, or Z cross-sectional profile {1}

DEFINITION

Classification: 277/489

Sectional piston ring structure:

(under subclass 434) Piston ring consisting of more than one component.

(1) Note. A piston ring placed as an original should have more than nominal structure before crossing in this and indented subclasses.

SEE OR SEARCH THIS CLASS, SUBCLASS:

446, for a piston ring or piston ring expander having means to limit rotation between another piston ring or piston ring expander.

488, for a piston ring expander engaging axially adjacent piston rings.

548, for a dynamic, segmented ring circumferentially contacting seal for other than piston having complementary interfitting adjoining rings.