US PATENT SUBCLASS 29 / 888.073
.~.~.~ Including rolling or die forming, e.g., drawing, punching

Current as of: June, 1999
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29 /   HD   METAL WORKING

592  DF  METHOD OF MECHANICAL MANUFACTURE {54}
888  DF  .~ Prime mover or fluid pump making {12}
888.07  DF  .~.~ Piston ring or piston packing making {6}
888.073.~.~.~ Including rolling or die forming, e.g., drawing, punching

DEFINITION

Classification: 29/888.073

Including rolling or die forming e.g., drawing, punching:

(under subclass 888.07) Process wherein the manufactured ring is shaped or worked (1) by compressive force exerted by opposed rotating rollers or (2) by plastic deformation in a tool used to impart shape.