US PATENT SUBCLASS 277 / 449
.~.~ Particular piston seat

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.~.~ Particular piston seat {6}
450  DF  .~.~.~> Helical form
451  DF  .~.~.~> Stepped walls
452  DF  .~.~.~> Oblique wall {1}
455  DF  .~.~.~> Arcuate wall
456  DF  .~.~.~> Coating, treatment, or wall insert
457  DF  .~.~.~> Having passageway for fluid return, pressure relief, or venting

DEFINITION

Classification: 277/449

Particular piston seat:

(under subclass 434) Seat therefor wherein the part (i.e., a piston) has more than a nominal groove structure on its cylindrical face to locate or retain the piston ring or piston ring expander.

(1) Note. The declaration of a groove or opposing sidewalls connected by an end wall is nominal structure.