US PATENT SUBCLASS 29 / 888.07
.~.~ Piston ring or piston packing making

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.~.~ Piston ring or piston packing making {6}
888.071  DF  .~.~.~> Including forging or hammering
888.072  DF  .~.~.~> Including casting or molding
888.073  DF  .~.~.~> Including rolling or die forming, e.g., drawing, punching
888.074  DF  .~.~.~> Including coating or plating
888.075  DF  .~.~.~> Including grinding or honing
888.076  DF  .~.~.~> Including machining or angular cutting

DEFINITION

Classification: 29/888.07

Piston ring or piston packing making:

(under subclass 888) Process for manufacturing a circular sealing element or component especially adapted for fitting around a piston and extending to the cylinder wall thus preventing leakage.

SEE OR SEARCH THIS CLASS, SUBCLASS:

888.3, for a process of making a seal having plural district layers.

SEE OR SEARCH CLASS

72, Metal Deforming, appropriate subclass for a process of shaping or working metal stock material.

277, Seal for a Joint or Juncture, for a generic sealing means or process,

434+, for a piston ring or piston ring expander or seat therefor, subclasses 922+ for a seal manufactured by bonding or joining or subclass 924 for a seal manufactured by deformation, material removal, or molding.