US PATENT SUBCLASS 29 / 890.12
.~ Valve or choke making

Current as of: June, 1999
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29 /   HD   METAL WORKING

592  DF  METHOD OF MECHANICAL MANUFACTURE {54}
890.12.~ Valve or choke making {5}
890.121  DF  .~.~> Repairing, converting, servicing or salvaging
890.122  DF  .~.~> Valve seat forming
890.123  DF  .~.~> Valve stem or tire valve making
890.124  DF  .~.~> With assembly, disassembly or composite article making {3}
890.132  DF  .~.~> Including metal shaping and diverse operation

DEFINITION

Classification: 29/890.12

Valve or choke making:

(under subclass 592) Process for manufacturing a gas and

water device which is especially useful for regulating or controlling the flow of fluids in a piping system or in machinery.

(1) Note. Installing a preformed valve or valve assembly, per se, into a fluid system, per se, is not herein or hereunder unless some significant shaping or manufacturing occurs such as valve seat forming or assembling valve subcomponents.

(2) Note. Prior to the establishment of these subclasses (890.12+), this subject matter was indented under "Gas and Water Device Making" (old 29/157+). Other subclasses under Class 29, subclasses 592+ have not been screened for this subject matter.