US PATENT SUBCLASS 277 / 441
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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}
440  DF  .~.~ Piston ring surface of dissimilar material or hardness {2}
441.~.~.~ Insert

DEFINITION

Classification: 277/441

Insert:

(under subclass 440) Piston ring wherein the surface of the piston ring has the different material, hardness, or density pushed into it.