US PATENT SUBCLASS 29 / 890.122
.~.~ Valve seat forming

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

592  DF  METHOD OF MECHANICAL MANUFACTURE {54}
890.12  DF  .~ Valve or choke making {5}
890.122.~.~ Valve seat forming

DEFINITION

Classification: 29/890.122

Valve seat forming:

(under subclass 890.12) Process including the step of permanently deforming, shaping or making the annular or circular ring upon which the valve head rests when the valve

is in a closed position.