US PATENT SUBCLASS 29 / 888.44
.~.~.~ Valve seat 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}
888.4  DF  .~.~ Poppet or I.C. engine valve or valve seat making {6}
888.44.~.~.~ Valve seat making

DEFINITION

Classification: 29/888.44

Valve seat making:

(under subclass 888.4) Process wherein the manufactured article is the circular ring on which the poppet valve or I.C. engine valve rests when closed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

890.122, for a process of making a valve seat, per se, not for a poppet or I.C. engine valve.