US PATENT SUBCLASS 29 / 888.042
.~.~.~ Multi-element piston 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}
888.04  DF  .~.~ Piston making {6}
888.042.~.~.~ Multi-element piston making {1}
888.043  DF  .~.~.~.~> Utilizing a high energy beam, e.g., laser, electron beam

DEFINITION

Classification: 29/888.042

Multi-element piston making:

(under subclass 888.04) Process wherein the piston is manufactured from a plurality of associated parts such as multiple body pieces or multiple skirt pieces, the parts being joined together to form a piston, but not including assembly with a connecting rod or with a gudgeon pin, wrist pin, piston pin or a boss therefor.

(1) Note. The multi-element piston may be made by composite casting or molding steps, but there must be recited subject matter which is beyond the scope of the casting class, Class 164, or the molding class, Class 264, for placement in this subclass.

(2) Note. Making a coated or clad piston, per se, is not sufficient for placement in this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

888.048, for method of making a piston by coating or cladding.