US PATENT SUBCLASS 29 / 888.4
.~.~ Poppet or I.C. engine valve or 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.~.~ Poppet or I.C. engine valve or valve seat making {6}
888.41  DF  .~.~.~> Valve guide making
888.42  DF  .~.~.~> Repairing, converting, servicing or salvaging
888.43  DF  .~.~.~> Valve tappet making
888.44  DF  .~.~.~> Valve seat making
888.45  DF  .~.~.~> Composite or hollow valve stem or head making {3}
888.46  DF  .~.~.~> With assembly or composite article making

DEFINITION

Classification: 29/888.4

Poppet or I.C. engine valve or valve seat making:

(under subclass 888) Process wherein the manufactured article is (1) a device that regulates fluid flow by means of a movable part that opens, shuts or partially obstructs a port or passageway, i.e., a valve which device rises perpendicularly to or from a circular ring on which the device rests when closed; (2) the circular ring for such a device; or (3) a part especially adapted for (1) or (2) which is not elsewhere classified.

SEE OR SEARCH THIS CLASS, SUBCLASS:

890.12, for a process of making a valve, per se.