US PATENT SUBCLASS 29 / 888.45
.~.~.~ Composite or hollow valve stem or head making

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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}
888.45.~.~.~ Composite or hollow valve stem or head making {3}
888.451  DF  .~.~.~.~> Including forging
888.452  DF  .~.~.~.~> Including extruding
888.453  DF  .~.~.~.~> Including casting

DEFINITION

Classification: 29/888.45

Composite or hollow valve stem or head making:

(under subclass 888.4) Process wherein the manufactured article is a disk part of the poppet or I.C. engine valve or a rod part which operates to open or close the valve, which disk part or rod part is (1) a unitary structure composed of at least two different materials or compositions with each material or composition retaining its identity or (2) a structure which is concave or has a cavity within.

(1) Note. Composite valves include both solid and substantially solid valves having metal or ceramic inserts; and they may contain a heat exchange fluid or a particulate material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

890.123, for a process of making a valve stem, per se.

890.124+, for a process of assembling a valve or making a composite valve.