US PATENT SUBCLASS 277 / 456
.~.~.~ Coating, treatment, or wall insert

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}
456.~.~.~ Coating, treatment, or wall insert

DEFINITION

Classification: 277/456

Coating, treatment or wall insert:

(under subclass 449) Particular piston seat wherein the groove has a portion subject to or formed by a substance, action or material addition.