US PATENT SUBCLASS 277 / 475
.~.~.~.~.~ Having more than one pair of such surfaces

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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}
472  DF  .~.~.~ Annular expander nested in annular groove of the piston ring {3}
474  DF  .~.~.~.~ And contacting surfaces therebetween are complementary {1}
475.~.~.~.~.~ Having more than one pair of such surfaces

DEFINITION

Classification: 277/475

Having more than one pair of such surfaces:

(under subclass 474) Contacting surfaces therebetween are complementary wherein the piston ring expander provides complementary surfaces for opposing annular recess surfaces of the piston ring.